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利用TEM,EDS和SAED等分析方法,研究了11Cr铁素体不锈钢409L在600℃敏化下析出物特性,并将双环电化学动电位再活化法(DL-EPR)用于评价409L钢的晶间腐蚀敏感性,通过研究DL-EPR的扫描速率、介质成分、介质温度对测试结果的影响,对该方法进行了优化,并用该优化法研究了敏化处理对409L钢晶间腐蚀敏感性的影响.结果表明,敏化的409L钢发生晶间腐蚀是由于M_(23)C_6沿晶界析出.在最优化条件下,DL-EPR法能定量评价409L钢的晶间腐蚀敏感性且具有良好的重复性.随敏化处理时间延长,沿晶界析出的M_(23)C_6增多,晶间腐蚀敏感性也随之增强.
The characteristics of precipitates of 409L steel 409L at 600 ℃ were studied by TEM, EDS and SAED. The double-ring electrochemical kinetic potential reactivation (DL-EPR) method was used to evaluate the properties of 409L steel The corrosion sensitivity of the 409L steel was studied by investigating the influence of the scanning rate, medium composition and medium temperature of the DL-EPR on the test results. The method was optimized by this optimization method. .The results show that the intergranular corrosion of 409L steel occurs due to the precipitation of M_ (23) C_6 along the grain boundaries.Divided by DL-EPR method, the intergranular corrosion sensitivity of 409L steel can be evaluated quantitatively with good With the extension of sensitization time, the amount of M_ (23) C_6 precipitated along the grain boundaries increases, and the intergranular corrosion sensitivity also increases.