Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871250
H. Yan, J. Dowries, P. Boden, S. Harris
SUBJECTTyres which are radially reinforced with high tensile steel cords need to develop a bond between the rubber and the steel. Brass coatings on the cord are currently used to promote the bond but deterioration takes place with time and corrosion of the underlying steel occurs eventually. Zinc-cobalt coatings have been used as a replacement for brass. These coatings are capable of being drawn in the cord making operation provided that the cobalt content is 1.5wt%. Pull-out tests after vulcanising show that zinc-cobalt promotes similar adhesive strengths to that achieved with brass coatings. After ageing in warm moist conditions for up to 16 days the zinc-cobalt coating maintained higher levels of adhesion than brass. In tyre tests the zinc-cobalt coatings were superior in preventing red rust formation on the steel
{"title":"Use of Zinc Alloy Coatings on Steel Cord Reinforcement in Vehicle Tyres","authors":"H. Yan, J. Dowries, P. Boden, S. Harris","doi":"10.1080/00202967.1999.11871250","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871250","url":null,"abstract":"SUBJECTTyres which are radially reinforced with high tensile steel cords need to develop a bond between the rubber and the steel. Brass coatings on the cord are currently used to promote the bond but deterioration takes place with time and corrosion of the underlying steel occurs eventually. Zinc-cobalt coatings have been used as a replacement for brass. These coatings are capable of being drawn in the cord making operation provided that the cobalt content is 1.5wt%. Pull-out tests after vulcanising show that zinc-cobalt promotes similar adhesive strengths to that achieved with brass coatings. After ageing in warm moist conditions for up to 16 days the zinc-cobalt coating maintained higher levels of adhesion than brass. In tyre tests the zinc-cobalt coatings were superior in preventing red rust formation on the steel","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"71-74"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871250","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871265
L. A. Degtjar, B. U. Dubov, I. D. Kudrjavtzeva, F. I. Kukos
Some aspects of nickel and nickel-boron alloys plating from low concentrated chloride colloid-electrolyte baths have been investigated. The nature of particles being reduced and the reason for the marked increase in rate of the electrodeposition are discussed. X-ray analysis suggests that the reason for the high and stable solderability of nickel-boron alloys is the presence in the structure of (Ni 3 B).O and (Ni 3 B).16O phases. The phase Ni 4 B 3 is assumed to increase the resistance to wear.
{"title":"The Electrodeposition of Nickel, Solderable and Wear-resistant Nickel-Boron Alloys from Low Concentrated Colloid-Electrolytes","authors":"L. A. Degtjar, B. U. Dubov, I. D. Kudrjavtzeva, F. I. Kukos","doi":"10.1080/00202967.1999.11871265","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871265","url":null,"abstract":"Some aspects of nickel and nickel-boron alloys plating from low concentrated chloride colloid-electrolyte baths have been investigated. The nature of particles being reduced and the reason for the marked increase in rate of the electrodeposition are discussed. X-ray analysis suggests that the reason for the high and stable solderability of nickel-boron alloys is the presence in the structure of (Ni 3 B).O and (Ni 3 B).16O phases. The phase Ni 4 B 3 is assumed to increase the resistance to wear.","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"123-126"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871265","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871273
J. Vinkevičius
The interaction of Cu 2 O + Cu(OH) 2 adsorbed with Na 2 S 4 in the course of formation of Cu 2 x S coatings by a cyclic method has been investigated using the methods of cyclic voltammetry and radiochemistry ( 35 S). (One cycle of Cu 2 x S coating formation consists of the treatment of the surface to be coated in a solution of Cu (I) + Cu (II) ammoniates, rinsing-hydrolysis and sulphidation in Na 2 S 4 solution). Only 25% of the Cu 2 x S coating has been found to be formed due to adsorption of Cu (I) + Cu (II) and up to 10% due to S 4 2 adsorption. The remaining portion (∼ 65%) of the coating is formed due to interaction of Cu (I) with elemental sulphur S 0 ad +2Cu + → CuS ad +Cu 2+ and the exchange occurring in the course of repeating the cycle CuS ad +2(1-x)Cu + → Cu 2-x S ad +(1-x) Cu 2+ . Elemental sulphur is supposed to be formed in a sulphidation stage through individual and mixed intermediates of Cu (I) and Cu (II) polysulphides as well as during the hydrolysis of the adsorbed S 4 2 (≤10% S o ).
铜2 O +铜之间的相互作用(OH) 2吸附过程中Na 2 S 4铜2 x的形成年代涂料通过循环方法调查使用循环伏安法和放射化学的方法(35 S)。(铜2 x年代涂层形成的一个周期的治疗的表面涂布在溶液中铜(I) +铜(II)加氨、rinsing-hydrolysis和硫化作用Na 2 S 4解决方案)。Cu (I) + Cu (II)吸附形成的cu2 x S涂层仅占25%，而s42吸附形成的cu2 x S涂层高达10%。镀层的剩余部分(~ 65%)是由Cu (I)与单质硫S 0 ad +2Cu +→Cu ad + cu2 +相互作用形成的，交换过程是在重复循环过程中发生的，即Cu ad +2(1-x)Cu +→Cu 2-x S ad +(1-x) cu2 +。单质硫应该在硫化阶段通过Cu (I)和Cu (II)多硫化物的单独和混合中间体以及吸附的s42(≤10% S o)的水解过程中形成。
{"title":"Some regularities of formation of Cu2-xS coatings","authors":"J. Vinkevičius","doi":"10.1080/00202967.1999.11871273","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871273","url":null,"abstract":"The interaction of Cu 2 O + Cu(OH) 2 adsorbed with Na 2 S 4 in the course of formation of Cu 2 x S coatings by a cyclic method has been investigated using the methods of cyclic voltammetry and radiochemistry ( 35 S). (One cycle of Cu 2 x S coating formation consists of the treatment of the surface to be coated in a solution of Cu (I) + Cu (II) ammoniates, rinsing-hydrolysis and sulphidation in Na 2 S 4 solution). Only 25% of the Cu 2 x S coating has been found to be formed due to adsorption of Cu (I) + Cu (II) and up to 10% due to S 4 2 adsorption. The remaining portion (∼ 65%) of the coating is formed due to interaction of Cu (I) with elemental sulphur S 0 ad +2Cu + → CuS ad +Cu 2+ and the exchange occurring in the course of repeating the cycle CuS ad +2(1-x)Cu + → Cu 2-x S ad +(1-x) Cu 2+ . Elemental sulphur is supposed to be formed in a sulphidation stage through individual and mixed intermediates of Cu (I) and Cu (II) polysulphides as well as during the hydrolysis of the adsorbed S 4 2 (≤10% S o ).","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"159-163"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871273","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871280
E. A. A. E. Meguid, S. S. Rehim, E. M. Moustafa
Preliminary experiments were carried out in order to electrodeposit good quality and satisfactory nickel plate on to copper substrates from gluconate baths. The effects were investigated of bath co...
为了在葡萄糖酸盐镀液中电沉积高质量和满意的镍板，进行了初步实验。研究了浴钴的影响。
{"title":"The electroplating of nickel from aqueous gluconate baths","authors":"E. A. A. E. Meguid, S. S. Rehim, E. M. Moustafa","doi":"10.1080/00202967.1999.11871280","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871280","url":null,"abstract":"Preliminary experiments were carried out in order to electrodeposit good quality and satisfactory nickel plate on to copper substrates from gluconate baths. The effects were investigated of bath co...","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"188-191"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871280","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58743018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871289
L. Yang, J. Farr, M. Ashworth, J. Charnock
{"title":"Characterisation of a RuO2 film thermally deposited on a titanium support","authors":"L. Yang, J. Farr, M. Ashworth, J. Charnock","doi":"10.1080/00202967.1999.11871289","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871289","url":null,"abstract":"","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"226-229"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871289","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58743345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871294
G. Ottewill, F. Walsh
{"title":"Moles, Molecular Masses and Relative Molecular Masses in Metal Finishing","authors":"G. Ottewill, F. Walsh","doi":"10.1080/00202967.1999.11871294","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871294","url":null,"abstract":"","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"248-249"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58743979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871239
V. Narasimhamurthy, B. Sheshadri
The compn., properties and morphol. of Zn-Co alloys contg. 0.8-1.1% Co deposited from an alk. sulfate bath contg. triethanolamine and gelatin have been investigated. A bath contg. a higher Co content produced an alloy with a higher Co content. The percentage Co in the alloy decreased with increasing c.d. A higher Co content in the alloy increased the alloy hardness. Morphol. of the alloy deposits depended on the amt. of Co in the alloy.
{"title":"Physico-chemical properties of Zn-Co alloy deposits from an alkaline sulphate bath containing triethanolamine and gelatin","authors":"V. Narasimhamurthy, B. Sheshadri","doi":"10.1080/00202967.1999.11871239","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871239","url":null,"abstract":"The compn., properties and morphol. of Zn-Co alloys contg. 0.8-1.1% Co deposited from an alk. sulfate bath contg. triethanolamine and gelatin have been investigated. A bath contg. a higher Co content produced an alloy with a higher Co content. The percentage Co in the alloy decreased with increasing c.d. A higher Co content in the alloy increased the alloy hardness. Morphol. of the alloy deposits depended on the amt. of Co in the alloy.","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"29-30"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58741939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871242
I. Motizuki, K. Izawa, Jyoji Watanabe, H. Honma
SUMMA RY - Mechanical solderless chip packaging with small gold bumps 1 has increased in electronic devices. The preparation of conductive particles (5 ∼ 7 μm diameter ) by electroless nickel plating has now been investigated. Generally, batch type electroless plating is applied to provide conductivity on nonconductors. Since the surface areas of particle s are much larger than the bulk substrate, accordingly the electroless plating bath becomes unstable. The continuous dropping method has therefore been applied, in the preparation of conductive particles Uniform coverage of deposited nickel on the particles was obtained by using ammonium acetate as a complexing agent, and surface coverage was further improved without coagulation of particles by treatment with a surface active agent before their introduction to the plating bath.
SUMMA RY -机械无焊芯片封装与小金块1已增加在电子设备。目前研究了化学镀镍制备导电颗粒(直径5 ~ 7 μm)的方法。一般来说，批量化学镀是为了在非导体上提供导电性。由于粒子s的表面积比基体大得多，因此化学镀液变得不稳定。因此，在制备导电颗粒时，采用连续滴镀法，以乙酸铵为络合剂，使沉积的镍均匀覆盖在颗粒上，在颗粒进入镀液前用表面活性剂处理，在颗粒不凝固的情况下，进一步提高了表面覆盖度。
{"title":"Preparation of anisotropic conductive fine particles by electroless nickel plating","authors":"I. Motizuki, K. Izawa, Jyoji Watanabe, H. Honma","doi":"10.1080/00202967.1999.11871242","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871242","url":null,"abstract":"SUMMA RY - Mechanical solderless chip packaging with small gold bumps 1 has increased in electronic devices. The preparation of conductive particles (5 ∼ 7 μm diameter ) by electroless nickel plating has now been investigated. Generally, batch type electroless plating is applied to provide conductivity on nonconductors. Since the surface areas of particle s are much larger than the bulk substrate, accordingly the electroless plating bath becomes unstable. The continuous dropping method has therefore been applied, in the preparation of conductive particles Uniform coverage of deposited nickel on the particles was obtained by using ammonium acetate as a complexing agent, and surface coverage was further improved without coagulation of particles by treatment with a surface active agent before their introduction to the plating bath.","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"41-43"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871248
A. Dent, A. Horlock, S. Harris, D. McCartney
Three Ni-Cr based powders (Metco 700, Armacor C and PSI-1) have been thermally sprayed using the HVOF process. The resultant deposits were then characterised using SEM, TEM and XRD. Microhardness surveys were carried out on the coatings together with abrasive wear tests. Coatings 250 μm thick, were produced with low oxides and porosity levels. The most consistent coatings were prepared from powder sources with a minimum particle size of 25 μm. Coating microstructures were either nano-crystalline or mixtures of amorphous and microcrystalline phases Boron additions to the powder encouraged the formation of amorphous coatings and higher microhardness values i.e. > 675 Hv. The formation of boride precipitates in the coatings does not appear to raise their hardness as the precipitates were either of larger diameter > 500 nm or present in low volume fractions Limited amounts of oxides were produced in the coatings, e.g. as α-Cr 2 O 3 or spinel oxide NiCr 2 O 4 particularly at intersplat boundaries. Abrasive wear resistance of the PSI-1 coating was superior to the other two coatings because it contains more amorphous material. The combination of wear and corrosion resistance associated with these coatings may prove to be attractive in many applications where both these properties are needed, carbides and borides.
{"title":"Enhanced wear resistant nickel-based alloy coatings produced by high velocity oxy-fuel spraying","authors":"A. Dent, A. Horlock, S. Harris, D. McCartney","doi":"10.1080/00202967.1999.11871248","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871248","url":null,"abstract":"Three Ni-Cr based powders (Metco 700, Armacor C and PSI-1) have been thermally sprayed using the HVOF process. The resultant deposits were then characterised using SEM, TEM and XRD. Microhardness surveys were carried out on the coatings together with abrasive wear tests. Coatings 250 μm thick, were produced with low oxides and porosity levels. The most consistent coatings were prepared from powder sources with a minimum particle size of 25 μm. Coating microstructures were either nano-crystalline or mixtures of amorphous and microcrystalline phases Boron additions to the powder encouraged the formation of amorphous coatings and higher microhardness values i.e. > 675 Hv. The formation of boride precipitates in the coatings does not appear to raise their hardness as the precipitates were either of larger diameter > 500 nm or present in low volume fractions Limited amounts of oxides were produced in the coatings, e.g. as α-Cr 2 O 3 or spinel oxide NiCr 2 O 4 particularly at intersplat boundaries. Abrasive wear resistance of the PSI-1 coating was superior to the other two coatings because it contains more amorphous material. The combination of wear and corrosion resistance associated with these coatings may prove to be attractive in many applications where both these properties are needed, carbides and borides.","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"60-63"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-01DOI: 10.1080/00202967.1999.11871256
J. Vinkevičius, G. Valiulienė, A. Žielienė
The interaction of the Cu 2 O adsorbed with Na 2 S n (n = 1-4 ), during formation of the Cu 2-x S coatings has been investigated by cyclic voltammetry. The summarized reaction of this process has been shown to correspond to the equation: Na 2 S + Cu 2 O ad + H 2 O → Cu 2 S ad + (n-1)S 0 + 2NaOH, where S 0 /Cu=(n 1)/2. Such a stoichiometry of reaction ca be explained by the formation of an intermediate the adsorbed polysulphide of Cu(1) and by its subsequent decomposition into Cu 2 S and S 0 . When a thicker coating is being formed, i.e., when the surface being coated is repeatedly immersed into an ammoniate solution of Cu (1) and S 0 fully bounded: S 0 ad + 2Cu + → CuS + Cu 2 + . At the same time due to different solubility products (L=2.5-10 and 6.3-10 for Cu 2 S and CuS respectively), an exchange CuS ad + 2 (1-x)Cy + →Cu 2-x S ad +(1-x)Cu 2+ occurs. After formation of Cu 2+ . parallel processes characteristic for the interaction of Cu(II) with Na 2 S n start to take place, during which S is also formed.
用循环伏安法研究了Cu 2-x - S涂层形成过程中Cu 2-x - S与Na 2 S - n (n = 1-4)吸附的相互作用。结果表明，该过程的反应规律为:na2s + cu2o + h2o→cu2s + (n-1) s0 + 2NaOH，其中s0 /Cu=(n -1) /2。这种反应的化学计量可以用吸附多硫化物Cu(1)的中间体的形成及其随后分解成cu2s和s0来解释。当形成较厚的涂层时，即将被涂层表面反复浸入Cu(1)和s0完全结合的氨化溶液中:s0 ad + 2Cu +→Cu + cu2 +。同时由于不同的溶解度产物(Cu 2s和Cu的L分别为2.5-10和6.3-10)，发生了Cu ad + 2 (1-x)Cy +→Cu 2-x S ad +(1-x)Cu 2+的交换。cu2 +形成后。Cu(II)与Na (2s) n相互作用的平行过程开始发生，S也在此过程中形成。
{"title":"The Role of Cu(I) in the Process of Forming Cu2–xS Coatings by a Chemical Route","authors":"J. Vinkevičius, G. Valiulienė, A. Žielienė","doi":"10.1080/00202967.1999.11871256","DOIUrl":"https://doi.org/10.1080/00202967.1999.11871256","url":null,"abstract":"The interaction of the Cu 2 O adsorbed with Na 2 S n (n = 1-4 ), during formation of the Cu 2-x S coatings has been investigated by cyclic voltammetry. The summarized reaction of this process has been shown to correspond to the equation: Na 2 S + Cu 2 O ad + H 2 O → Cu 2 S ad + (n-1)S 0 + 2NaOH, where S 0 /Cu=(n 1)/2. Such a stoichiometry of reaction ca be explained by the formation of an intermediate the adsorbed polysulphide of Cu(1) and by its subsequent decomposition into Cu 2 S and S 0 . When a thicker coating is being formed, i.e., when the surface being coated is repeatedly immersed into an ammoniate solution of Cu (1) and S 0 fully bounded: S 0 ad + 2Cu + → CuS + Cu 2 + . At the same time due to different solubility products (L=2.5-10 and 6.3-10 for Cu 2 S and CuS respectively), an exchange CuS ad + 2 (1-x)Cy + →Cu 2-x S ad +(1-x)Cu 2+ occurs. After formation of Cu 2+ . parallel processes characteristic for the interaction of Cu(II) with Na 2 S n start to take place, during which S is also formed.","PeriodicalId":23268,"journal":{"name":"Transactions of The Institute of Metal Finishing","volume":"77 1","pages":"91-94"},"PeriodicalIF":1.9,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00202967.1999.11871256","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58742448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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