采用动电位极化技术、慢应变速率拉伸(SSRT)试验和SEM形貌分析等方法,研究了外加电位对X80钢在南雄土壤模拟溶液中的应力腐蚀破裂(SCC)行为的影响.结果表明,在不同外加电位下,X80钢在土壤模拟溶液中呈现出不同的SCC敏感性.在-550 mV(SCE,下同)阳极电位下,X80钢的阳极溶解抑制了其SCC的发生；在自腐蚀电位Ecorr(约-720 mY)下,X80钢SCC行为呈现出受阳极溶解和氢脆混合控制的机制；在-850 mV阴极电位下,阴极保护抑制了X80钢SCC的发生；而在-1 000 mV和-1 150 mV阴极电位下,氢脆在X80钢SCC过程中占重要作用.
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