Pub Date : 2002-10-01DOI: 10.1179/000705902225006615
S. Lyon, R. Howard, J. Scantlebury
Abstract Cyclic dip testing of coil coated architectural claddings was carried out in order to understand the mechanisms of cut edge corrosion. Thus, a number of nominally identical materials from the same manufacturer, but with varying steel thickness (and, hence, zinc to steel area ratios at the cut edge) were examined. The degree of disbondment of the organic coating from the cut edge was measured after 1000 h. For a constant thickness of zinc coating, the results demonstrate a linear relationship between the degree of coating disbondment and the thickness of the steel substrate. Further, the trend line showed a positive amount of disbondment when ex trapolated to zero thickness of steel. It is concluded that the cathodic disbondment mechanism plays an important role in the initiation of organic coating failure at the cut edge. However, the kinetics of cut edge disbondment is dominated by the anodic undermining mechanism.
{"title":"Kinetic mechanisms for cut edge corrosion of coil coated architectural cladding","authors":"S. Lyon, R. Howard, J. Scantlebury","doi":"10.1179/000705902225006615","DOIUrl":"https://doi.org/10.1179/000705902225006615","url":null,"abstract":"Abstract Cyclic dip testing of coil coated architectural claddings was carried out in order to understand the mechanisms of cut edge corrosion. Thus, a number of nominally identical materials from the same manufacturer, but with varying steel thickness (and, hence, zinc to steel area ratios at the cut edge) were examined. The degree of disbondment of the organic coating from the cut edge was measured after 1000 h. For a constant thickness of zinc coating, the results demonstrate a linear relationship between the degree of coating disbondment and the thickness of the steel substrate. Further, the trend line showed a positive amount of disbondment when ex trapolated to zero thickness of steel. It is concluded that the cathodic disbondment mechanism plays an important role in the initiation of organic coating failure at the cut edge. However, the kinetics of cut edge disbondment is dominated by the anodic undermining mechanism.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"46 1","pages":"214 - 216"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75054454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1109/MCOMSTD.2017.7992922
C. Jacquenet, Yannick Lair, F. L. Faucheur, K. Ma, A. Mahoney, Brian Rosen, Timothy B. Terriberry, Mo Zanaty, Roni Even, Bron Gondwana, B. Leiba, S. Mansfield, B. Gracie, Jaafar Elmirghanni, G. Camarillo, R. Sparks, R. Housley
{"title":"Standards news","authors":"C. Jacquenet, Yannick Lair, F. L. Faucheur, K. Ma, A. Mahoney, Brian Rosen, Timothy B. Terriberry, Mo Zanaty, Roni Even, Bron Gondwana, B. Leiba, S. Mansfield, B. Gracie, Jaafar Elmirghanni, G. Camarillo, R. Sparks, R. Housley","doi":"10.1109/MCOMSTD.2017.7992922","DOIUrl":"https://doi.org/10.1109/MCOMSTD.2017.7992922","url":null,"abstract":"","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"218 1","pages":"166 - 169"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90053028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225004446
B. Mosayebi, M. Kazemeini, A. Badakhshan, A. Safekordi
Abstract Various corrosion inhibitors, including: 1-hydrox y ethylene-1,1 diphosphonic acid (HEDP), sodium molybdate, and zinc ions with various concentrations of chloride ion, were added to an aqueous corrosive medium, and the corrosion rate of the carbon steel was measured at various temperatures. It is shown that the corrosion rate is increased when the temperature or chloride ion concentration is enhanced, while if the concentration of HEDP or molybdate is increased, the corrosion rate is lowered. Furthermore, it is observed that in presence of more than 1200 ppm of the chloride ion and temperatures greater than or equal to 42·5°C the combination of HEDP, molybdate and zinc cannot control the corrosion in a cooling water system. Ultimately, a formulation consisting of HEDP, 2-phosphono butane-1, 2,4 tricarbox ylic acid, tolyltriazole, zinc, and polymeric compounds has been developed and tested in an industrial cooling water unit. Results have shown that the corrosion rate may be lowered to less than 25 μm per year.
{"title":"Effect of phosphonate based corrosion inhibitors in a cooling water system","authors":"B. Mosayebi, M. Kazemeini, A. Badakhshan, A. Safekordi","doi":"10.1179/000705902225004446","DOIUrl":"https://doi.org/10.1179/000705902225004446","url":null,"abstract":"Abstract Various corrosion inhibitors, including: 1-hydrox y ethylene-1,1 diphosphonic acid (HEDP), sodium molybdate, and zinc ions with various concentrations of chloride ion, were added to an aqueous corrosive medium, and the corrosion rate of the carbon steel was measured at various temperatures. It is shown that the corrosion rate is increased when the temperature or chloride ion concentration is enhanced, while if the concentration of HEDP or molybdate is increased, the corrosion rate is lowered. Furthermore, it is observed that in presence of more than 1200 ppm of the chloride ion and temperatures greater than or equal to 42·5°C the combination of HEDP, molybdate and zinc cannot control the corrosion in a cooling water system. Ultimately, a formulation consisting of HEDP, 2-phosphono butane-1, 2,4 tricarbox ylic acid, tolyltriazole, zinc, and polymeric compounds has been developed and tested in an industrial cooling water unit. Results have shown that the corrosion rate may be lowered to less than 25 μm per year.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"69 1","pages":"217 - 224"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84441578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225006598
M. Ergun, L. Akçay
Abstract The dependence of the pitting potential Ep of 1018 carbon steel on chloride concentration, pH and the temperature of the solution was studied by the potentiodynamic method in accordance with a statistical experimental design. The parameters of the empirical pitting potential model determined on the basis of Box-W ilson ex perimental design method were evaluated using the experimental data. Comparison of the predicted values from the model with the observed values showed that the model is a good fit. From the model equation the most noble pitting potential value of -225 mV (SCE) was obtained when the Cl- ion concentration, temperature and pH of the solution were 205 ppm, 25°C, and 6·4, respectively. The Box-Wilson experimental design technique was proved to be applicable in modelling the pitting potential of carbon steel.
{"title":"Investigation of pitting potential of carbon steel using experimental design method","authors":"M. Ergun, L. Akçay","doi":"10.1179/000705902225006598","DOIUrl":"https://doi.org/10.1179/000705902225006598","url":null,"abstract":"Abstract The dependence of the pitting potential Ep of 1018 carbon steel on chloride concentration, pH and the temperature of the solution was studied by the potentiodynamic method in accordance with a statistical experimental design. The parameters of the empirical pitting potential model determined on the basis of Box-W ilson ex perimental design method were evaluated using the experimental data. Comparison of the predicted values from the model with the observed values showed that the model is a good fit. From the model equation the most noble pitting potential value of -225 mV (SCE) was obtained when the Cl- ion concentration, temperature and pH of the solution were 205 ppm, 25°C, and 6·4, respectively. The Box-Wilson experimental design technique was proved to be applicable in modelling the pitting potential of carbon steel.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"257 1","pages":"235 - 238"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78025695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225004455
Rainer Landgrebe, M. Gugau, H. Friederich, A. Meese
Abstract Thread forming fasteners incorporate both drilling and hole tapping features and are commonly used in the construction industry to fix together steel sheets of different material types. With this practical application in mind, fasteners manufactured from martensitic and austenitic stainless steels have been subjected to alternating corrosion conditions in accordance with test standards DIN 50021-SS and DIN 50018-K WF 2·0. The torque applied to the screws during these tests was controlled to place the fasteners under equal tensile loads, independent of their tensile strength. Thus, the results provided information on their relative susceptibilities to stress corrosion cracking. At the end of the tests, up to 80% of the martensitic stainless steel drilling and tapping screws had failed due to hydrogen induced stress corrosion cracking. The fasteners manufactured from austenitic materials withstood identical test conditions without any evidence of cracking or crack initiation. It is concluded that fasteners manufactured from modified martensitic stainless steel are more susceptible to stress corrosion cracking under the conditions of test than those made from cold worked austenitic stainless steels. This suggests that in practical applications the potential for catastrophic failure due to stress corrosion cracking could be considerably higher in modified martensitic fasteners in comparison with austenitic stainless steel fasteners, including those with hardened carbon steel drill points.
{"title":"Stainless steel thread forming screws and their susceptibility to stress corrosion cracking","authors":"Rainer Landgrebe, M. Gugau, H. Friederich, A. Meese","doi":"10.1179/000705902225004455","DOIUrl":"https://doi.org/10.1179/000705902225004455","url":null,"abstract":"Abstract Thread forming fasteners incorporate both drilling and hole tapping features and are commonly used in the construction industry to fix together steel sheets of different material types. With this practical application in mind, fasteners manufactured from martensitic and austenitic stainless steels have been subjected to alternating corrosion conditions in accordance with test standards DIN 50021-SS and DIN 50018-K WF 2·0. The torque applied to the screws during these tests was controlled to place the fasteners under equal tensile loads, independent of their tensile strength. Thus, the results provided information on their relative susceptibilities to stress corrosion cracking. At the end of the tests, up to 80% of the martensitic stainless steel drilling and tapping screws had failed due to hydrogen induced stress corrosion cracking. The fasteners manufactured from austenitic materials withstood identical test conditions without any evidence of cracking or crack initiation. It is concluded that fasteners manufactured from modified martensitic stainless steel are more susceptible to stress corrosion cracking under the conditions of test than those made from cold worked austenitic stainless steels. This suggests that in practical applications the potential for catastrophic failure due to stress corrosion cracking could be considerably higher in modified martensitic fasteners in comparison with austenitic stainless steel fasteners, including those with hardened carbon steel drill points.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"82 1","pages":"206 - 213"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83743723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225004338
M. Takeuchi, G. Whillock
Abstract The effect of NOx purging on the corrosion behaviour of stainless steel in hot 8M nitric acid has been investigated. Gravimetric corrosion rate measurements and electrochemical potential and polarisation data made on nitric acid grade (NAG) 18/10L stainless steel are related to the concentration of nitrous acid produced by NOx purging, which in turn is related to the solution redox potential measured using clean Pt. Purging with NOx is shown to reduce the redox potential of nitric acid solution, but in the absence of other dissolved species acts as an oxidising agent to stainless steel and increases the corrosion rate. T he effect of NOx purging saturates at relatively low flow rate owing to the fact that the solution becomes saturated with nitrous acid. However, in 8M nitric acid containing 3 g L-1 Fe and 0·7 g L-1 Ru at 100°C, NOx purging has no effect on the corrosion rate of NAG 18/10L. This is considered to indicate that Fe and Ru at these concentrations polarise stainless steel to the same corrosion potential as NOx is capable of achieving.
摘要研究了NOx吹扫对不锈钢在高温8M硝酸中腐蚀行为的影响。在硝酸级(NAG) 18/10L不锈钢上进行的重力腐蚀速率测量、电化学电位和极化数据与NOx净化产生的硝酸浓度有关，而硝酸浓度又与使用清洁Pt测量的溶液氧化还原电位有关。用NOx净化可以降低硝酸溶液的氧化还原电位。但在没有其他溶解物质的情况下，对不锈钢起氧化作用，增加腐蚀速度。在较低的流速下，由于溶液被亚硝酸饱和，NOx的净化效果达到饱和。而在100℃下，在含有3 g L-1 Fe和0.7 g L-1 Ru的8M硝酸中，NOx吹扫对NAG 18/10L的腐蚀速率没有影响。这被认为表明铁和钌在这些浓度下使不锈钢极化到与NOx能够达到的腐蚀电位相同。
{"title":"Effect of NOx gases on corrosion of stainless stell in hot nitric acid solutions","authors":"M. Takeuchi, G. Whillock","doi":"10.1179/000705902225004338","DOIUrl":"https://doi.org/10.1179/000705902225004338","url":null,"abstract":"Abstract The effect of NOx purging on the corrosion behaviour of stainless steel in hot 8M nitric acid has been investigated. Gravimetric corrosion rate measurements and electrochemical potential and polarisation data made on nitric acid grade (NAG) 18/10L stainless steel are related to the concentration of nitrous acid produced by NOx purging, which in turn is related to the solution redox potential measured using clean Pt. Purging with NOx is shown to reduce the redox potential of nitric acid solution, but in the absence of other dissolved species acts as an oxidising agent to stainless steel and increases the corrosion rate. T he effect of NOx purging saturates at relatively low flow rate owing to the fact that the solution becomes saturated with nitrous acid. However, in 8M nitric acid containing 3 g L-1 Fe and 0·7 g L-1 Ru at 100°C, NOx purging has no effect on the corrosion rate of NAG 18/10L. This is considered to indicate that Fe and Ru at these concentrations polarise stainless steel to the same corrosion potential as NOx is capable of achieving.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"19 1","pages":"199 - 205"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79418036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225006589
B. Bozzini, C. Lenardi, M. Serra, A. Fanigliulo
Abstract This paper reports on the anodic behaviour of as plated (X-ray amorphous) and heat treated (crystalline) high P electroless Ni-P deposits investigated by potentiodynamic and potentiostatic methods in acidic aqueous chloride solutions. Potentiodynamic measurements show an active-passive behaviour for both structures. The valence of P dissolution was assessed by the weight loss v. charge technique; dissolution valences do not correlate clearly with potentiodynamic behaviour. This can nevertheless be clearly interpreted in terms of ex situ X-ray photoelectron spectroscopy analyses of attacked layer composition; the layers formed at lower anodic potential within the passive range consist of NiO, the ones obtained at high anodic polarisation contain phosphate. Differences in anodic behaviour of as plated and heat treated specimens can be explained in terms of the defectiveness of protective NiO layers as a function of grain boundaries emerging at the surface.
{"title":"Electrochemical and X-ray photoelectron spectroscopy investigation into anodic behaviour of electroless Ni–9·5 wt-%P in acidic chloride environment","authors":"B. Bozzini, C. Lenardi, M. Serra, A. Fanigliulo","doi":"10.1179/000705902225006589","DOIUrl":"https://doi.org/10.1179/000705902225006589","url":null,"abstract":"Abstract This paper reports on the anodic behaviour of as plated (X-ray amorphous) and heat treated (crystalline) high P electroless Ni-P deposits investigated by potentiodynamic and potentiostatic methods in acidic aqueous chloride solutions. Potentiodynamic measurements show an active-passive behaviour for both structures. The valence of P dissolution was assessed by the weight loss v. charge technique; dissolution valences do not correlate clearly with potentiodynamic behaviour. This can nevertheless be clearly interpreted in terms of ex situ X-ray photoelectron spectroscopy analyses of attacked layer composition; the layers formed at lower anodic potential within the passive range consist of NiO, the ones obtained at high anodic polarisation contain phosphate. Differences in anodic behaviour of as plated and heat treated specimens can be explained in terms of the defectiveness of protective NiO layers as a function of grain boundaries emerging at the surface.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"47 1","pages":"173 - 181"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74599393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225004437
W. Nimmo, A. Griffiths, L. Orkney, A. Mensah, A. Turnbull
Abstract Three test methods, namely immersion tests, galvanostatic anodic dissolution tests and the scanning vibrating probe technique, have been evaluated as candidate methods for ascertaining the susceptibility of welds in carbon steels to preferential corrosion. The use of hardness measurements by profiling and mapping was also evaluated. Three welds were tested for which the production had been controlled to produce different types of corrosion behaviour. In addition, a weld that had failed 'in service' was used to validate the findings of this assessment. In the immersion tests, lasting 9 months, the three controlled weld specimens ex posed to ASTM D1141 sea water behaved as expected, in terms of which region of the weld was most susceptible to corrosion. The results of the rapid galvanostatic anodic dissolution tests compared well with those of the immersion tests, with the same regions of the controlled welds showing susceptibility to corrosion. The galvanostatic anodic dissolution test on the failed weld produced corrosion in the regions that had been susceptible to corrosion in service. However, at very high current densities the differential corrosion loss between different regions of the weld was not maintained and careful control of this parameter is therefore necessary in testing. The scanning vibrating probe technique successfully identified the areas susceptible to preferential corrosion in both the controlled weld specimens and the in service failure. The electrolyte used was ASTM D1141 sea water diluted 10 : 1 with distilled water. However, these trends were not apparent when tests were conducted in distilled water owing to the lower solution conductivity. Hardness mapping produced a two-dimensional visual representation of the specimen hardness. This was very effective in locating small regions of high hardness, in contrast to conventional hardness profiling, and would be effective in locating hot spots for hydrogen embrittlement. However, no correlation between hardness and corrosion susceptibility was observed in the three weld specimens that were examined. The galvanic anodic dissolution test is recommended as a rapid and reliable test to determine the relative corrosion susceptibility of carbon steel welds. The scanning vibrating probe technique can also be effective but at considerably greater expense.
{"title":"Evaluation of techniques for measuring corrosion activity of carbon steel welds","authors":"W. Nimmo, A. Griffiths, L. Orkney, A. Mensah, A. Turnbull","doi":"10.1179/000705902225004437","DOIUrl":"https://doi.org/10.1179/000705902225004437","url":null,"abstract":"Abstract Three test methods, namely immersion tests, galvanostatic anodic dissolution tests and the scanning vibrating probe technique, have been evaluated as candidate methods for ascertaining the susceptibility of welds in carbon steels to preferential corrosion. The use of hardness measurements by profiling and mapping was also evaluated. Three welds were tested for which the production had been controlled to produce different types of corrosion behaviour. In addition, a weld that had failed 'in service' was used to validate the findings of this assessment. In the immersion tests, lasting 9 months, the three controlled weld specimens ex posed to ASTM D1141 sea water behaved as expected, in terms of which region of the weld was most susceptible to corrosion. The results of the rapid galvanostatic anodic dissolution tests compared well with those of the immersion tests, with the same regions of the controlled welds showing susceptibility to corrosion. The galvanostatic anodic dissolution test on the failed weld produced corrosion in the regions that had been susceptible to corrosion in service. However, at very high current densities the differential corrosion loss between different regions of the weld was not maintained and careful control of this parameter is therefore necessary in testing. The scanning vibrating probe technique successfully identified the areas susceptible to preferential corrosion in both the controlled weld specimens and the in service failure. The electrolyte used was ASTM D1141 sea water diluted 10 : 1 with distilled water. However, these trends were not apparent when tests were conducted in distilled water owing to the lower solution conductivity. Hardness mapping produced a two-dimensional visual representation of the specimen hardness. This was very effective in locating small regions of high hardness, in contrast to conventional hardness profiling, and would be effective in locating hot spots for hydrogen embrittlement. However, no correlation between hardness and corrosion susceptibility was observed in the three weld specimens that were examined. The galvanic anodic dissolution test is recommended as a rapid and reliable test to determine the relative corrosion susceptibility of carbon steel welds. The scanning vibrating probe technique can also be effective but at considerably greater expense.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"68 1","pages":"182 - 193"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78642298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225004428
T. P. Hutchinson
Abstract In data published by Cheng and Luo (British Corrosion Journal, 2000), the variance to mean ratio of the number of pitting events on carbon steel is less than 1. It is here argued that this is evidence for inhibition between events, not for promotion. The branch of probability known as renewal theory is useful for analysing counts of events occurring in time, the intervals between them, and the intensity of events.
{"title":"Evidence for inhibition between pitting events on carbon steel","authors":"T. P. Hutchinson","doi":"10.1179/000705902225004428","DOIUrl":"https://doi.org/10.1179/000705902225004428","url":null,"abstract":"Abstract In data published by Cheng and Luo (British Corrosion Journal, 2000), the variance to mean ratio of the number of pitting events on carbon steel is less than 1. It is here argued that this is evidence for inhibition between events, not for promotion. The branch of probability known as renewal theory is useful for analysing counts of events occurring in time, the intervals between them, and the intensity of events.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"656 1","pages":"239 - 240"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87669856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-10-01DOI: 10.1179/000705902225006606
C. Batt, J. Dodson, M. Robinson
Abstract Hydrogen embrittlement tests were carried out using double cantilever beam and slow strain rate tensile specimens to measure the susceptibility of a 900 MPa yield strength steel in different marine environments, ranging from sterile sea water and filtered natural sea water to open sea water and seabed sediment. The cathodic protection potential and the presence of biologically generated sulphides in seabed sediment were shown to be important factors that controlled the extent of hydrogen uptake and embrittlement. Threshold stress intensities Kth were measured for each condition and the optimum cathodic protection potential to control corrosion with the minimum risk of embrittlement was established.
{"title":"Hydrogen embrittlement of cathodically protected high strength steel in sea water and seabed sediment","authors":"C. Batt, J. Dodson, M. Robinson","doi":"10.1179/000705902225006606","DOIUrl":"https://doi.org/10.1179/000705902225006606","url":null,"abstract":"Abstract Hydrogen embrittlement tests were carried out using double cantilever beam and slow strain rate tensile specimens to measure the susceptibility of a 900 MPa yield strength steel in different marine environments, ranging from sterile sea water and filtered natural sea water to open sea water and seabed sediment. The cathodic protection potential and the presence of biologically generated sulphides in seabed sediment were shown to be important factors that controlled the extent of hydrogen uptake and embrittlement. Threshold stress intensities Kth were measured for each condition and the optimum cathodic protection potential to control corrosion with the minimum risk of embrittlement was established.","PeriodicalId":9349,"journal":{"name":"British Corrosion Journal","volume":"73 1","pages":"194 - 198"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90175374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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