应用控电位的电化学极化试验，测定了J55钢高频直缝电阻焊（ERW）油井套管焊接区的沟槽腐蚀敏感性。3种规格的J55钢ERW套管在3.5%NaCl溶液中电化学极化144h后，测定的结果表明，套管焊接区沟槽腐蚀敏感性系数强烈依赖于套管用钢的含C量，随含C量升高沟槽腐蚀敏感性增大。焊接后模拟热处理对降低ERW套管焊接区沟槽腐蚀敏感性系数有一定的作用，足够加热时间的无相变退火热处理显著降低ERW套管焊接区沟槽腐蚀敏感性系数，腐蚀介质和介质温度对沟槽腐蚀敏感性系数无显著的影响。
An anodic dissolution at potential of -550mV(vs. SCE) is applied to investigate the grooving corrosion sensitivity of J55 steel oil well casing in electric resistance welding (ERW) zone. The grooving corrosion sensitivity coefficient α of three types of the ERW casings after polarized for 144h in 3.5% NaCl solution depends intensively on the carbon content of J55 steel. The grooving corrosion sensitivity rises as the carbon content of the steel increases. The simulated heat treatment after ERW welding can decrease the α value to some extent, and the annealing treatment with enough time below the phase transformation point reduces the α value of ERW casing considerably. The corrosive solution and test temperature have no apparent effects on the grooving corrosion sensitivity coefficient.
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