局部阳极腐蚀部位析氢的实验证据及其对腐蚀开裂机制的影响

IF 2.4 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
H. Hoffmeister, Eike Heuser
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引用次数: 0

摘要

摘要通过观察慢应变速率试样在阳极腐蚀过程中从裂纹中产生气泡的现象,研究了氯离子水溶液中外加电位对17-4 PH钢慢应变速率试验中气体数量、组成及断裂应变的影响。因此,施加电位的增加降低了断裂应变,同时释放的氢气体积也随之增加。断裂表面呈现出越来越脆的外观,正如在氢裂纹失效中所发现的那样。结果证实,在局部阳极腐蚀过程中,产生氢,引起阳极溶解后的氢致开裂。在不同的外加电位下,各自的局部pH值测量显示了坑电解液的酸化。附加的模型计算说明了逐步局部阳极腐蚀及其酸化过程以及氢支撑开裂。该模型表明,氢裂化的相对量取决于所提供的材料数据以及溶液性质,如pH值、氯化物水平、温度和氧含量。结果表明,结合模型计算,阳极局部腐蚀过程中析氢的实验证据证实了氢裂解对阳极应力腐蚀开裂的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental evidence of hydrogen evolution from local anodic corrosion sites and its consequences for corrosion cracking mechanisms
Abstract Based on observation of gas bubbles evolving from crevices on slow strain rate test pieces during anodic corrosion the effect of applied potentials in chloride aqueous solutions on amount and composition of the gas together with fracture strains from the slow strain rate test of a 17-4 PH steel was investigated. As a result, increasing applied potentials provide a reduction of fracture strains together with an initial increase in volume of released hydrogen gas. The fracture surfaces exhibit increasing brittle appearance, as found in hydrogen cracking failures. The results confirm that during local anodic corrosion, hydrogen is produced that provokes hydrogen induced cracking following anodic dissolution. Respective local pH measurements under varying applied electric potentials, show the acidification of the pit-electrolyte. Additional model calculations elucidate the stepwise local anodic corrosion and its acidification process together with the hydrogen supported cracking. The model shows that the relative amount of hydrogen cracking will depend on the provided material data as well as on solution properties such as pH, chloride level, temperature and oxygen content. As an all over result, together with the model calculations, the experimental evidence of hydrogen evolution during anodic local corrosion confirms the contribution of hydrogen cracking to anodic stress corrosion cracking.
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来源期刊
Materials Testing
Materials Testing 工程技术-材料科学:表征与测试
CiteScore
4.20
自引率
36.00%
发文量
165
审稿时长
4-8 weeks
期刊介绍: Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.
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