采用慢速率拉伸试验(SSRT)方法及电化学测量技术,研究了阴极电位下X70钢在某种近中性介质中的应力腐蚀开裂(SCC)机理.试验表明,在近中性介质中,随着电位的降低,管线钢的SCC敏感性增强.但当电位低于某一范围后,SCC敏感性减弱;随着溶液pH值的降低,管线钢的腐蚀速率增大,敏感电位区间负移.分析表明,在近中性介质中,管线钢应力腐蚀开裂主要受阳极溶解和氢致开裂两种机理的联合作用,氢的渗入可能与氢的还原过程及管线钢阳极溶解密切相关.适宜的电位可以使阳极溶解和氢的联合作用增强.增强应力腐蚀开裂倾向.
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