摘要
通过电化学渗氢技术与恒载荷拉伸试验方法,研究了不同充氢电流密度下S135钻杆用钢的氢扩散系数、试样中的可扩散氢浓度及其氢致开裂门槛应力。结果表明,S135钻杆用钢在0.5 mol/L H2SO4+0.25 g/L As2O3溶液中电化学充氢后的可扩散氢浓度C0与充氢电流密度的平方根i成正比,恒载荷条件下,氢致开裂门槛应力σHIC随可扩散氢浓度的对数lnC0的升高而下降。
Hydrogen permeation coefficient and diffusible hydrogen content in drill pipe steel S135 during cathodic charging with hydrogen were studied by an electrochemical method, and the hydrogen induced cracking （HIC） threshold stress of the steel was investigated using constant load tests. Experimental results showed that during dynamical charging of drill pipe steel S135 with hydrogen in 0. 5 mol/ L H2SO4 ＋0. 25 g/L As2O3 solution, the concentration of diffusible hydrogen Co was directly proportional to cathodic current density i. The threshold stress σHIC decreased linearly with increasing logarithm of hydrogen concentration lnco in constant load tests.
出处
《腐蚀与防护》
CAS
北大核心
2009年第11期787-790,共4页
Corrosion & Protection
关键词
S135钻杆用钢
氢渗透
氢致开裂
门槛应力
drill pipe steel S135
hydrogen permeation
hydrogen induced cracking （HIC）
threshold stress
