三种不同点蚀深度测量方法的比对分析

Comparative analysis of three different pitting depth measurement methods

目的本文主要介绍三种测量点蚀深度的方法:金相法、测微计法和显微法,并探讨它们在不同点蚀情况下的差异及其对测量结果的影响。方法本文针对碳钢和不锈钢表面的腐蚀坑,利用这三种测量方法分别对这两种典型材质表面的点蚀坑进行测量,并对测量结果进行了分析和讨论。结果通过对比测量结果可知:金相法较为精确,但该方法属于破坏性测量;测微计法仅适用于宽浅型的点蚀坑;显微镜法不仅适用于宽浅型的点蚀坑,也适用于点蚀坑底部较为窄小的情况。结论(1)针对宽浅的点蚀坑,金相法、测微计法和显微法三种方法均适用且结果一致;(2)针对底部窄小的点蚀坑,金相法和显微镜法较为适用且结果一致;(3)金相法、显微镜法和测微计法测量腐蚀深度时,应考虑均匀腐蚀造成的厚度减少量并对结果进行修正,尤其是在均匀腐蚀较为明显的情况下。

Objective This article mainly introduces three methods for measuring pitting depth:metallographic method,micrometer method and microscopy method,and discusses their differences in different pitting conditions and their influence on the measurement results.Methods Pitting pits on the surface of carbon steel and stainless steel were respectively measured by using these three measuring methods.and the measured results were analyzed and discussed.Results By comparing the measurement results,we can see that the metallographic method is more accurate,but it is destructive.The micrometer method is only suitable for wide and shallow pitting pits.The microscope method is not only suitable for wide and shallow pitting pits,but also for the small pit bottom.Conclusion(1)For wide and shallow pitting pits,metallographic method,micrometer method and microscopic method are applicable and the results are consistent;(2)For the small pitting pit at the bottom,metallography and microscopy are more suitable and the results are consistent;(3)When the corrosion depth is measured by metallographic,microscope and micrometer methods,the thickness reduction caused by uniform corrosion should be taken into account and the results should be corrected,especially in the case of more obvious uniform corrosion.