Chemical corrosion refers to corrosion damage caused by purely chemical interactions between metallic materials and non-electrolytes. The characteristics of the reaction process are: a direct oxidation-reduction reaction occurs between the surface of the material and the oxidant in the non-electrolyte.
Corrosion products are generated on the surface where the corrosion reaction occurs. When the reaction products are firmly covered on the surface of the material, further corrosion will be slowed down. The corrosion process is not accompanied by the generation of electric current.
Chemical corrosion processing, that is, chemical etching processing, mainly refers to controlled corrosion. Controlled corrosion is the process of putting the corroded metal into an electrolyte solution for corrosion. The corrosion process of metal in the electrolyte solution is the same as the chemical process mentioned above. Corrosion is fundamentally different. The characteristic of this corrosion process is that the corrosion process is divided into two independent and simultaneous anode (oxidation reaction) and cathode (reduction reaction) processes.
The significant difference from chemical corrosion is that electric current is generated during this corrosion process, so this kind of corrosion is also called electrochemical corrosion, which is the most common corrosion. It can be thought that the chemical corrosion processing that people usually talk about is actually It refers to electrochemical corrosion, that is, electrochemical etching. Of course, chemical corrosion and electrochemical corrosion coexist in the actual corrosion process. It’s just that electrochemical corrosion dominates in the electrolyte solution.
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