High potential inhibition of the 17-4 PH stainless steel in the presence of Nitrate and evolution of metastable pitting

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Pub Date : 2023-07-11 DOI:10.5006/4281

Seyedeh Sajedeh Mousavi, M. Seyedi, M. Moayed, M. Mirjalili, I. Taji, Seyed Hossein Hosseini Mortazavi

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Abstract

In the present investigation, the potential effect of Nitrate ions' inhibition on pitting corrosion of 17-4 precipitation hardening stainless steel in different Chloride and Nitrate concentrations was investigated using potentiostatic and potentiodynamic examinations. Furthermore, metastable pitting was examined in depth to clarify Nitrate inhibition. The results demonstrate that adding Nitrate as an inhibitor to the Chloride containing solution decreases the metastable pit peak current, stability products, and pit radius. In contrast, no significant difference between metastable pit lifetime was observed in the presence and absence of Nitrate in the Chloride solution. It was also shown that introducing 17-4PH stainless steel to the high potential resulted in the repassivation of the surface, even if the Nitrate/Chloride concentration ratio was less than the critical value needed for Nitrate inhibition. Overall, Nitrate ions have an inhibition effect in the Chloride solution. Especially at very high potential, whether the Nitrate concentration was less than the critical value or not, Nitrate forces the surface to get repassivated.

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17-4PH不锈钢在硝酸盐存在下的高电位抑制和亚稳点蚀的演变

在本研究中，通过恒电位和动电位检测，研究了硝酸根离子在不同氯化物和硝酸盐浓度下对17-4沉淀硬化不锈钢点蚀的潜在抑制作用。此外，对亚稳点蚀进行了深入检查，以阐明硝酸盐的抑制作用。结果表明，在含氯化物的溶液中加入硝酸盐作为抑制剂可以降低亚稳态凹坑峰值电流、稳定性产物和凹坑半径。相反，在氯化物溶液中存在和不存在硝酸盐的情况下，未观察到亚稳凹坑寿命之间的显著差异。研究还表明，即使硝酸盐/氯化物的浓度比低于硝酸盐抑制所需的临界值，将17-4PH不锈钢引入高电位也会导致表面的再钝化。总的来说，硝酸根离子在氯化物溶液中具有抑制作用。特别是在非常高的电势下，无论硝酸盐浓度是否低于临界值，硝酸盐都会迫使表面重新钝化。

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

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.