摘要
在0.3%NaCl溶液中,采用干湿交替腐蚀加速试验和电化学阻抗谱(EIS)方法研究了合金元素Cu、Mn对低合金钢大气腐蚀行为的影响,并用X射线衍射(XRD)分析研究了合金元素Cu、Mn对钢表面锈层组成的影响。结果表明,Cu合金化通过加速阴极铁锈的还原来促使生成含更多Fe3O4的连续内锈层,并通过提高表面锈层的黏附性来抑制阳极铁的溶解;而Mn合金化由于抑制阴极还原而无法形成连续的保护性锈层,导致阳极溶解加速,使钢的耐蚀性降低。
The atmospheric corrosion performance of Mn - and Cu - bearing steels was studied by dry/wet cycb'c corrosion tests (CCT) with 60% relative humidity at 30 ℃. The salt droplet used for CCT was 0. 3% NaCl solution. The rusted specimens were investigated by gravimetry, electrochemical techniques and XRD analysis. The results showed that the steel containing 0. 30%Cu showed higher corrosion resistance than plain carbon steel due to the accelerated rust reduction in cathodic region, which facilitated the formation of the inner rust layer containing more Fe3O4. While the 1. 43 % Mn - bearing steel showed a worse corrosion resistance than carbon steel owing to the depressed cathodic reduction and accelerated dissolution of iron in anode.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第10期19-22,共4页
Materials Protection
基金
国家重大基础研究发展规划(973)(2004CB619101)
国家自然科学基金重大项目(50499336)
