Knowledge gaps exist concerning the acoustic emission (AE) during the pitting corrosion of open morphology. Here, we proposed a simple yet effective strategy to control the pitting evolution uncovered by lacy covers or corrosion products in a vertically positioned 304 stainless steel (304 SS) specimen that was pretreated by immersion in dilute nitric acid. The corrosion pit developed with a “head” and a “tail”, i.e., the open cavity and the corrosion products deposited below the pit head respectively, the evolution of which was monitored with by-stage AE signals. The AE sources associated with the open-morphology of pitting corrosion were discussed.

中文翻译：

---

稀硝酸钝化的304不锈钢开孔形态点蚀过程中的声发射监测

在开放形态的点蚀过程中，存在关于声发射（AE）的知识空白。在这里，我们提出了一种简单而有效的策略，以控制在垂直放置的304不锈钢（304 SS）标本中通过浸入稀硝酸中进行预处理的花边盖或腐蚀产物未发现的点蚀演变。腐蚀坑形成有“头部”和“尾部”，即开孔和腐蚀产物分别沉积在坑头下方，并通过分阶段的AE信号监控腐蚀的演变。讨论了与点蚀开放形态有关的AE源。