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首页> 外文期刊>Journal of Materials Engineering and Performance >Development of EPR Test Technique for Alloy 800
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Development of EPR Test Technique for Alloy 800

机译：合金800的EPR测试技术的发展

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The degree of sensitization (DOS) of austenitic stainless steels and some nickel-based alloys (e.g., alloy 600) is evaluated by the electrochemical potentiokinetic reactivation (EPR) test. In this study a number of test solutions based on H_2SO_4 + KSCN composition have been evaluated to establish a reliable EPR test method for alloy 800. Different passivation (vertex) potentials are also tested. It has been shown that dilute test solutions with lower vertex potentials resulted in single loop (SL) and double loop (DL) EPR test methods that distinguished between different sensitized samples and also between sensitized and desensitized samples. It has been shown that an SL-EPR test in 1 M H_2SO_4 + 0.002 M KSCN (de-aerated) at 26 deg C at a scan rate of 3 mV/s from a vertex potential of 700 mV_SCE (180 s hold time) gave results that matched with the DOS indicated by microstructures and the Huey test results. Similarly, the DL-EPR test in 1 M H_2SO_4+0.002 M KSCN (de-aerated) at 26 deg C, forward scanning from the OCP to + 700 mV_SCE and then backward scanning from there to the OCP at a scan rate of 2 mV/s produced a good measure of DOS as indicated by the Huey test results. The effectiveness of the EPR test was ascertained by testing on alloy 800 containing Ti and Al (alloy 800 HT) and Nb (alloy 800 Nb).
机译：奥氏体不锈钢和某些镍基合金（例如600合金）的敏化度（DOS）通过电化学电位动力学再活化（EPR）测试进行评估。在这项研究中，已经评估了许多基于H_2SO_4 + KSCN组成的测试溶液，以建立可靠的800合金EPR测试方法。还测试了不同的钝化（顶点）电势。已经显示出具有较低顶点电势的稀释测试溶液导致了单环（SL）和双环（DL）EPR测试方法，这些方法可以区分不同的敏化样品以及敏化和脱敏样品。已经显示，在1 M H_2SO_4 + 0.002 M KSCN（脱气）中于26摄氏度下以3 mV / s的扫描速率从700 mV_SCE的顶点电势（保持180 s的时间）进行SL-EPR测试得出微观结构和Huey测试结果表明与DOS相匹配的结果。同样，在26°C的1 M H_2SO_4 + 0.002 M KSCN（脱气）中进行DL-EPR测试，从OCP向前扫描到+ 700 mV_SCE，然后以2 mV的扫描速度从那里反向扫描到OCP如Huey测试结果所示，/ s可以很好地测量DOS。通过对含有Ti和Al（合金800 HT）和Nb（合金800 Nb）的800合金进行测试，可以确定EPR测试的有效性。

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