35CrMo和00Cr13Ni5Mo硫化氢环境应力腐蚀开裂

用慢应变速率拉伸实验和U形试样浸泡实验、电化学极化技术并结合微观分析手段，在湿硫化氢介质中研究了35CrMo和00Cr13Ni5Mo两种钢的应力腐蚀开裂行为规律。结果表明，35CrMo和00Cr13Ni5Mo钢在实验条件下均具有一定应力腐蚀开裂（SCC）敏感性，其敏感性随着溶液pH的降低和H₂ S浓度的增大而增大;00Cr13Ni5Mo 在实验条件下抗SCC的能力均高于同条件下的35CrMo，在pH3.0的溶液中，二者性能比较接近，在pH4.5的溶液中，00Cr13Ni5Mo 耐H₂S环境SCC的性能明显提高，高于35CrMo，这主要是因为00Cr13Ni5Mo中的耐蚀合金元素增强了其钝化膜的稳定性、降低了氢脆作用所致。

Stress corrosion cracking behavior of 35CrMo and 00Cr13Ni5Mo steels in hydrogen sulfide solutions

Stress corrosion cracking (SCC) behavior of 35CrMo low alloy steel and 00Cr13Ni5Mo stainless steel in hydrogen sulfide environment was investigated by using slow strain rate test (SSRT), U-bent-specimen immersion test and electrochemincal polarization techniqueBoth 35CrMo steel and 00Cr13Ni5Mo steel were susceptible to SCC in various H₂ s solutions, and their SCC susceptibilities reduced with the increase of pH value within 3.0 and 4.5 or the decrease of H₂ s concentration from saturation to 1000 μg·g^-100Cr13Ni5Mo steel was less susceptible to SCC than 35CrMo steel in each tested H₂ S condition, but its SCC susceptibility was affected more evidently by the change of pH value than that of 35CrMo steelThe SCC susceptibility factor of 00Cr13Ni5Mo steel was close to that of 35CrMo steel in solutions with lower pH values, while in solution with a pH value of 4.5, the resistance of 00Cr13Ni5Mo stainless steel to hydrogen sulfide stress corrosion cracking was much higher than that of 35CrMoIt was due to the higher concentration of some anticorrosive elements, such as Cr, in 00Cr13Ni5Mo, that promoted the formation of a more stable passive film, leading to a higher hydrogen induced cracking (HIC) resistance of 00Cr13Ni5Mo than 35CrMo in higher pH conditions.