高钙质海水中低碳钢的中短期腐蚀:碳酸钙浓度、试样取向和营养物添加的影响

IF 1.1 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Pub Date : 2024-01-09 DOI:10.5006/4453
Peter J. Richardson, R. Melchers
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引用次数: 0

摘要

低碳钢暴露于海洋浸泡条件下,碳酸盐溶解度超标,导致钙质沉积,与溶解度不超标因而没有钙质沉积的腐蚀条件相比,低碳钢的腐蚀速率大大降低。但是,文献中还没有系统地研究这些条件下腐蚀的差异,包括 MIC 的潜在影响。本文报告的研究涉及低碳钢试样在天然海水(对照)和使用添加了以下物质的相同海水源环境中的中短期海洋浸泡暴露(最长 18 个月):1) CaCO3,作为无机颗粒悬浮物,代表钙质含量较高的海水中的无机颗粒悬浮物;以及 2) 硝酸盐,作为工业污染物和细菌营养源。研究结果表明,悬浮在海水中的微粒 CaCO3 沉积在锈蚀物上或沉积到锈蚀物中,在多大程度上降低了低碳钢的腐蚀速度;研究发现,这一速度取决于锈蚀物在海水中的取向。与具有代表性的对照试样相比,永久埋在沉淀 CaCO3 颗粒盖下的试样的腐蚀速率降低了 70%。结果还显示,在这些暴露持续时间和条件下,虽然经过 18 个月的暴露后,在锈蚀产物本身中发现了高浓度的 IRB 和 SRB 细菌物种(分别为 ~1 × 106 cfu/g 和 ~1 × 102 至 4 × 106 cfu/g,取决于试样的方向),但没有明显的 MIC 证据。这些研究结果表明,对低碳钢的 MIC 进行短期和中期(非加速)研究不足以预测这些环境中的长期腐蚀率,甚至会产生误导。
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Short- to medium-term corrosion of mild steel in highly calcareous seawaters: effects of calcium carbonate concentration, coupon orientation and nutrient addition
Mild steels exposed to marine immersion conditions in which carbonate solubilities are exceeded, leading to deposition of calcareous material, have been shown to exhibit much reduced corrosion rates compared with corrosion under conditions in which there is no exceedance of solubility limits and therefore no calcareous deposition. However, the differences in corrosion including the potential effect of MIC in these conditions have not been examined systematically in the literature. The study reported herein involves short- to medium-term marine immersion exposures (up to 18 months) of mild steel coupons in natural seawater (control) and in environments using the same seawater source dosed with: 1) CaCO3, acting as an inorganic particulate suspension representative of that encountered in seawater with elevated calcareous content, and 2) a nitrate salt, acting as an industrial pollutant and bacterial nutrient source. The results show the extent to which the deposition of particulate CaCO3 from suspension in seawater onto and into the rusts reduces the rate of corrosion of mild steel; a rate that was found to be dependent on the coupon orientation within the seawater. Coupons which were permanently buried beneath a cap of settled CaCO3 particles exhibited a 70% reduction in corrosion rate compared with the representative control coupons. The results also show that for these exposure durations and conditions, while IRB and SRB bacterial species were identified in high concentrations (respectively ~1 × 106 cfu/g and ~1 × 102 to 4 × 106 cfu/g, depending on coupon orientation) within the rust products themselves after 18 months of exposure, there was no clear evidence of MIC. These findings indicate that short and medium term (non-accelerated) studies of MIC for mild steel are insufficient or even mis-leading for the prediction of long-term corrosion rates in these environments.
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来源期刊
Corrosion
Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING
CiteScore
2.80
自引率
12.50%
发文量
97
审稿时长
3 months
期刊介绍: CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.
期刊最新文献
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