Learn about the classification of metal corrosion
Thread Content
There are various methods for classifying metal corrosion, and the two main methods are as follows: 1. Classified by the corrosion process, it mainly includes chemical corrosion and electrochemical corrosion. Chemical corrosion is damage resulting from a direct chemical reaction between a metal and an environmental medium, with no electric current generated during the corrosion process. Electrochemical corrosion is damage to metals caused by electrochemical reactions in an electrolyte solution, with an electric current being generated during the corrosion process. Any medium that causes electrochemical corrosion is conductive. The main difference between electrochemical corrosion and chemical corrosion is that the former can be divided into two independent yet simultaneous cathodic and anodic processes, whereas chemical corrosion does not have this characteristic. Electrochemical corrosion is more common and widespread than chemical corrosion. 2. Based on the pattern of metal corrosion damage and the distribution of the corroded areas, it is divided into general corrosion and local corrosion. General corrosion refers to corrosion that occurs over the entire surface of the metal. Corrosion that occurs mainly in certain areas on the metal surface is known as local corrosion.
Metal corrosion can be divided into two categories: chemical corrosion and electrochemical corrosion. Chemical corrosion refers to the direct reaction between a metal and environmental media, without the generation of an electric current ； Electrochemical corrosion occurs in an electrolyte, accompanied by the generation of electric current. Furthermore, based on the distribution of corrosion, it can also be divided into general corrosion and local corrosion. General corrosion affects the entire metal surface, whereas localized corrosion is confined to specific areas. .