pH值对高温高压水中304L不锈钢应力腐蚀开裂的影响  

Effects of pH values on the stress corrosion cracking of 304L stainless steel in high-temperature and high-pressure water

作　　者：董超芳[1] 关矞心[1,2] 程学群[1] 刘飞华[2] 李岩[2] 任爱[2] 李晓刚[1] 

机构地区：[1]北京科技大学腐蚀与防护中心,北京100083 [2]苏州热工研究院寿命评估中心,苏州215004

出　　处：《北京科技大学学报》2010年第12期1569-1573,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目((No.50871020)

摘　　要：在高温高压水环境中,采用慢应变速率拉伸试验方法,研究了不同pH值对304L不锈钢应力腐蚀开裂行为的影响规律,并通过扫描电镜对试样断口形貌进行观察与分析.结果表明:在300℃时,304L不锈钢在弱酸性和弱碱性溶液中的应力腐蚀开裂敏感性较大,且酸性越强,敏感性越大.在中性溶液中,304L不锈钢的强度和塑性损失较小,应力腐蚀敏感性较小,断口分析与之吻合.The effects of pH values on the stress corrosion cracking（SCC）of 304L stainless steel in high-temperature and high-pressure water were studied using slow strain rate tension（SSRT）tests.The fracture morphology of SCC specimens was analyzed with the aid of scanning electron microscopy（SEM）.It is shown that 304L stainless steel exhibits a high susceptibility to SCC in weak alkaline and acidic solutions at 300 ℃,and the susceptibility increases by decreasing the pH value of the solution.In neutral solutions,both the strength and toughness of 304L stainless steel display a limited loss,indicating that 304L stainless steel has a low susceptibility to SCC.Fractography analysis is also consistent with these conclusions.

关 键 词：不锈钢 应力腐蚀开裂 腐蚀 拉伸试验 

分 类 号：TG172.82[金属学及工艺—金属表面处理]