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首页> 外文期刊>Measurement Science & Technology >Monitoring of stress corrosion cracking in stainless steel weldments by acoustic and electrochemical measurements
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Monitoring of stress corrosion cracking in stainless steel weldments by acoustic and electrochemical measurements

机译：通过声学和电化学测量监测不锈钢焊件中的应力腐蚀开裂

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A new hybrid monitoring technique for chloride stress corrosion cracking (SCC) is proposed. It uses both the acoustic emission (AE) and corrosion potential fluctuation (CPF) techniques. This paper discusses the results of SCC tests on butt-welded Type 304 stainless steel pipes. The weld pipe suffered transgranular (TG)-SCC in a concentrated magnesium chloride solution (40 mass(percent)), but suffered intergranular (IG) attack and falling-off of grains in a heat-affected zone (HAZ) in a dilute chloride solution (35 mass(percent)). SCC initiations in both concentrated and dilute corrodants were successfully monitored using a CPF technique. However, the CPF technique could not monitor the propagation of the SCC. This propagation could be detected using an AE technique. Secondary AE was produced by hydrogen gas evolution and by the cracking of corrosion products, and the primary AE was produced by the falling-off of grains due to the mutual actions of anodic dissolution and the mechanical fracture along a chromium-depleted zone in the grain boundary. The volume of metal loss by the dissolution was predicted from the local anodic current due to the fluctuation of the corrosion potential, and was found to correspond to the volume of the grain boundary attack. The fact that the primary AE was detected just after rapid drop (RD)-type CPF suggested that the grain boundary corrosion caused the falling-off of the grain that produced the primary AE.
机译：提出了一种新的氯应力腐蚀裂纹混合监测技术。它同时使用了声发射（AE）和腐蚀电位波动（CPF）技术。本文讨论了对接焊接304型不锈钢管的SCC测试结果。焊管在浓氯化镁溶液（40质量％）中经历了穿晶（TG）-SCC，但在稀氯化物中受热影响区（HAZ）遭受了晶间（IG）侵蚀和晶粒脱落。溶液（35质量％）。使用CPF技术成功监测了浓腐蚀剂和稀腐蚀剂中的SCC引发。但是，CPF技术无法监视SCC的传播。可以使用AE技术检测此传播。二次AE是由氢气的释放和腐蚀产物的开裂产生的，而一次AE是由于阳极溶解和晶粒沿铬贫化区的机械断裂的相互作用而掉落而产生的。边界。由于腐蚀电位的波动，由局部阳极电流预测了因溶解而产生的金属损失量，发现其与晶界侵蚀的量相对应。在快速下降（RD）型CPF之后立即检测到初级AE的事实表明，晶界腐蚀导致产生初级AE的晶粒脱落。

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