双相不锈钢2605N与铁素体不锈钢Cr30的腐蚀性能  

Corrosive Resistances of Duplex Stainless Steel 2605N and Ferrite Stainless Steel Cr30

作　　者：鲍崇高[1] 潘继勇[2] 

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710049 [2]沈阳铸造研究所,辽宁沈阳110022

出　　处：《铸造》2010年第10期1024-1026,共3页Foundry

基　　金：国家自然科学基金资助项目(50572087)

摘　　要：以双相不锈钢2605N和铁素体不锈钢Cr30为研究对象,比较了两种材料的显微组织与力学性能,并分别进行了化学浸泡腐蚀试验和含3.5%NaCl溶液的电解腐蚀试验,分析了试验材料的腐蚀失效形式。化学浸泡腐蚀试验结果表明,Cr30的腐蚀速率是2605N的7倍多;电解腐蚀试验揭示了2605N腐蚀失效的主要形式是小孔腐蚀,而Cr30的腐蚀失效形式同时包含晶界腐蚀和小孔腐蚀;双相不锈钢材料中合金元素形成致密的氧化膜(Cr2O3、NiO等)是其耐腐蚀性能优越的主要原因,而Cr30材料中基体与碳化物间存在的电位差引起相界腐蚀,并且碳化物的耐腐蚀性较差导致Cr30的耐腐蚀性能变差。Ferrite stainless steel Cr30 and duplex stainless steel 2605N were chosen as research subjects to compare their microstructures and mechanical properties.Corrosion tests with 3.5% NaCl solution and electrolytic solution for duplex stainless steel 2605N and ferrite stainless steel Cr30 were carried out to analyze the corrosion pattern.The research results show that corrosion rate of ferrite stainless steel Cr30 is 7 times as fast as that of duplex stainless steel 2605N in the chemical immersion corrosion;the main corrosion failure form of duplex stainless steel 2605N is pitting corrosion,but pitting corrosion and crystal boundary corrosion coexist in the corrosion of ferrite stainless steel Cr30 in the electrolytic corrosion;superior corrosion resistance of 2605N benefits from the high density film（Cr2O3,NiO）,while the poor corrosion resistance of Cr30 results from the crystal boundary corrosion caused by the potential difference between the carbide and the matrix,and the poor corrosion resistance of the carbides.

关 键 词：双相不锈钢 铁素体不锈钢 晶界腐蚀 小孔腐蚀 

分 类 号：TG142.71[一般工业技术—材料科学与工程]