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应用慢应变速率拉伸试验和电化学方法研究了湿硫化氢溶液中UNS J91450不锈钢的电化学行为对应力腐蚀开裂的影响.结果表明,本实验条件下UNS J91540不锈钢具有较高的SCC敏感性,并随着溶液pH的降低而明显增大.该不锈钢的电化学行为对它的腐蚀开裂(SCC)敏感性具有重要影响.开路电位下该不锈钢的SCC行为同时受氢脆作用和裂纹尖端阳极溶解作用的影响.在pH较低的介质中析氢电流较高而裂纹尖端阳极溶解作用略低,而在pH较高的介质中析氢电流较低而裂纹尖端的阳极溶解作用相对增强.氢脆作用对UNS J91540不锈钢SCC敏感性影响更显著.
The effect of electrochemical behavior of UNS J91450 stainless steel in wet hydrogen sulfide solution on stress corrosion cracking was studied by slow strain rate tensile test and electrochemical method.The results show that UNS J91540 stainless steel has higher SCC sensitivity under the experimental conditions, The electrochemical behavior of this stainless steel has an important influence on its SCC susceptibility.The SCC behavior of the stainless steel under both open circuit and open-circuit potentials is also affected by both hydrogen embrittlement and anodic dissolution at the crack tip The effect of hydrogen evolution current is relatively high in the lower pH medium and slightly lower in the anodic dissolution at the crack tip, but lower in the medium with higher pH and relatively stronger anodic dissolution at the crack tip. UNS J91540 stainless steel SCC sensitivity more significant impact.