7020铝合金在Cl-环境下的应力腐蚀与局部腐蚀性能及其相关性分析

罗先甫, 刘晓勇, 张文利, 查小琴, 张恒坤

doi:10.16577/j.cnki.42-1215/tb.2021.01.009

材料保护 >

2021 , Vol. 54 >Issue 1: 57 - 62

DOI: https://doi.org/10.16577/j.cnki.42-1215/tb.2021.01.009

试验研究

7020铝合金在Cl^-环境下的应力腐蚀与局部腐蚀性能及其相关性分析

展开

中国船舶重工集团公司第七二五研究所

罗先甫，工程师，硕士，电话：0379-67256513，E-mail：luoxf_csu@126.com

收稿日期: 2020-07-16

网络出版日期: 2025-07-09

收起

Stress Corrosion Cracking and Localized Corrosion Properties of 7020 Aluminum Alloy under Cl- Environment and Their Correlation Analysis

Expand

(The 725th Research Institute of China Shipbuilding Industry Corporation, Luoyang 471023, China)

Received date: 2020-07-16

Online published: 2025-07-09

Fold

摘要

为进一步加深对铝合金在Cl-环境下腐蚀行为的认识，通过浸泡试验、金相分析、极化曲线测试、慢应变速率拉伸测试、扫描电镜、透射电镜观察等，研究腐蚀环境对7020铝合金的局部腐蚀和应力腐蚀开裂(SCC)行为的影响，并对二者的相关性进行分析。结果表明：7020铝合金在50 ℃下的3.5%NaCl溶液中浸泡24 h，合金局部腐蚀敏感性很小；在3.5%NaCl+0.5%H2O2溶液中浸泡24 h，合金局部腐蚀敏感性增大。在50 ℃条件下，与3.5%NaCl溶液比较，合金在3.5%NaCl+0.5%H2O2溶液中的应力腐蚀敏感性较小。由于外部环境差异，7020铝合金在Cl-浓度不变情况下，其局部腐蚀与应力腐蚀并没有特定相关性。

关键词： 7020铝合金; 局部腐蚀; 慢应变速率拉伸; 应力腐蚀开裂敏感性; 3.5%NaCl+0.5%H₂O₂溶液

本文引用格式

罗先甫, 刘晓勇, 张文利, 查小琴, 张恒坤 . 7020铝合金在Cl^-环境下的应力腐蚀与局部腐蚀性能及其相关性分析[J]. 材料保护, 2021 , 54(1) : 57 -62 . DOI: 10.16577/j.cnki.42-1215/tb.2021.01.009

Abstract

In order to further recognize the corrosion behaviors of aluminum alloy in Cl--contained environment, the means of immersing experiment, metallographic observation, polarization curves measurement, slow strain rate tension, scanning electron microscope and transmission electron microscope were employed to study the localized corrosion, stress corrosion cracking(SCC)performance and the correlation between the localized corrosion and the stress corrosion of 7020 aluminum alloy.Results showed that 7020 aluminum alloy had little local corrosion sensitivity immersed in 3.5% NaCl solution at 50 ℃ for 24 h.On the contrast, the local corrosion sensitivity increased when the sample was immersed in 3.5% NaCl +0.5% H2O2 solution at 50 ℃ for 24 h.Moreover, the stress corrosion sensitivity of the alloy in 3.5% NaCl + 0.5% H2O2 solution was lower than that of the 3.5% NaCl solution at 50 ℃.Due to the difference of the external environment, there was no specific correlation between the localized corrosion and the stress corrosion of 7020 alloy when the Cl- concentration was constant.

Key words： 7020 aluminum alloy; localized corrosion; slow strain tensile testing; stress corrosion cracking susceptibility; 3.5% NaCl +0.5% H₂O₂ solution

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract