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模拟饮用水中含铅和无铅黄铜的腐蚀行为及应力腐蚀开裂敏感性

Corrosion Behavior and Susceptibility to Stress Corrosion Cracking of Leaded and Lead-Free Brasses in Simulated Drinking Water.

作者信息

Choucri Jamal, Balbo Andrea, Zanotto Federica, Grassi Vincenzo, Touhami Mohamed Ebn, Mansouri Ilyass, Monticelli Cecilia

机构信息

Corrosion and Metallurgy Study Centre "A. Daccò", University of Ferrara, 44121 Ferrara, Italy.

Laboratory of Materials Engineering and Environment, Modelling and Application, University Ibn Tofail, Kenitra 14000, Morocco.

出版信息

Materials (Basel). 2021 Dec 25;15(1):144. doi: 10.3390/ma15010144.

DOI:10.3390/ma15010144
PMID:35009290
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8746281/
Abstract

Duplex α + β' brasses are widely used in drinking water distribution systems for tube fittings, valves, and ancillaries because they are low cost, easy to fabricate, and exhibit high mechanical strength. However, depending on application conditions and alloy composition, they may undergo dealloying and stress corrosion cracking. In this research, three different brass types, two leaded (CW617N and CW602N) alloys and one lead-free brass (CW724R), were investigated to assess their corrosion behavior and susceptibility to stress corrosion cracking (SCC) in simulated drinking water (SDW) solutions containing different chloride concentrations, compatible with drinking water composition requirements according to Moroccan standard NM 03.7.001. The corrosion behavior was assessed by electrochemical tests such as polarization curve recording and electrochemical impedance spectroscopy (EIS) monitoring, coupled to SEM-EDS surface observations. The susceptibility to SCC was investigated by slow strain rate tests (SSRT). The tests showed that corrosion was mainly under diffusion control and chlorides slightly accelerated corrosion rates. All alloys, and particularly CW617N, were affected by SCC under the testing conditions adopted and in general the SCC susceptibility increased at increasing chloride concentration.

摘要

双相α + β'黄铜因其成本低、易于制造且具有较高的机械强度，而被广泛应用于饮用水分配系统中的管件、阀门及附件。然而，根据应用条件和合金成分的不同，它们可能会发生脱合金化和应力腐蚀开裂。在本研究中，对三种不同类型的黄铜进行了研究，即两种含铅合金（CW617N和CW602N）以及一种无铅黄铜（CW724R），以评估它们在模拟饮用水（SDW）溶液中的腐蚀行为以及对应力腐蚀开裂（SCC）的敏感性。该模拟饮用水溶液含有不同的氯化物浓度，符合摩洛哥标准NM 03.7.001规定的饮用水成分要求。通过极化曲线记录和电化学阻抗谱（EIS）监测等电化学测试，并结合扫描电子显微镜-能谱仪（SEM-EDS）表面观察来评估腐蚀行为。通过慢应变速率试验（SSRT）研究对应力腐蚀开裂的敏感性。试验表明，腐蚀主要受扩散控制，氯化物会略微加速腐蚀速率。在采用的测试条件下，所有合金，尤其是CW617N，都受到应力腐蚀开裂的影响，并且一般来说，随着氯化物浓度的增加，应力腐蚀开裂的敏感性也会增加。

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