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2.点蚀金属表面上局限在点或孔穴这样小面积上的腐蚀,叫做“点蚀”(或称“孔蚀”)。这样的定义是从腐蚀形态出发的,而不顾其腐蚀机理如何,例如黄铜脱锌、缝隙腐蚀和湍流腐蚀都造成点蚀。本篇将首先以不锈钢或其它依赖钝化而耐蚀的金属为主要对象讨论点蚀机理和影响因素,然后分別简介碳铜、铝,特别是铜的点蚀特性。至于缝隙腐蚀和湍流腐蚀将在以后两篇中分别介绍。2.1 点蚀机理许多金属,特別是那些依赖钝化而耐蚀
2. Pitting corrosion on metal surfaces limited to small areas such as points or holes is called “pitting” (or “pitting”). This definition is based on corrosion morphology, regardless of its corrosion mechanism, such as brass dezincification, crevice corrosion and turbulence corrosion cause pitting. This article will first discuss the pitting corrosion mechanism and its influencing factors with stainless steel or other metals that depend on passivation and corrosion resistance, and then introduce the pitting characteristics of copper, aluminum and copper in particular. As for the crevice corrosion and turbulent corrosion will be introduced in the next two. 2.1 pitting mechanism Many metals, especially those that rely on passivation and corrosion