采用电化学测试、慢应变速率试验(SSRT)、扫描电镜(SEM)形貌分析等方法,研究了X80钢在模拟我国西北地区碱性土壤环境中的应力腐蚀行为,分析了外加阴极电位对应力腐蚀的影响.结果表明,X80钢在土壤模拟溶液中呈现出应力腐蚀敏感性;外加电位对应力腐蚀有明显影响,在-850 mV(相对SCE)的阴极电位下,抑制了应力腐蚀;而在-950 mV和-1 050 mV(相对SCE)条件下,阳极溶解和氢的联合作用影响应力腐蚀过程.同时,外加阴极电位越负,氢对应力腐蚀的影响越大.
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