Difference between chemical corrosion and chemical corrosion processing

Chemical corrosion refers to the corrosion damage caused by the pure chemical action that occurs between the metal material and the non-electrolyte. Its reaction process is characterized by: the material surface of the yard and non-electrolyte in the oxidant directly redox reaction, corrosion products generated in the corrosion reaction occurs on the surface, when the reaction products firmly covered in the surface of the material, it will slow down further corrosion, the corrosion process is not accompanied by the generation of electric current.

Chemical corrosion processing, that is, chemical etching processing, mainly refers to the controlled corrosion, controlled corrosion is the corroded metal into the electrolyte solution for corrosion process, the metal in the electrolyte solution corrosion process and the above said chemical corrosion is fundamentally different. This corrosion process is characterized by: the corrosion process is divided into two independent and simultaneous anodic (oxidation reaction) and cathodic (reduction reaction) process. Significant difference with chemical corrosion is that this corrosion process has a current, so this corrosion is also known as electrochemical corrosion, is one of the most common corrosion, it can be argued that people usually talk about chemical corrosion processing in fact refers to electrochemical corrosion, that is, electrochemical etching processing. Of course, in the actual corrosion process of chemical corrosion and electrochemical corrosion exists at the same time. Just in the electrolyte solution electrochemical corrosion is dominant.