Overview of Five Most Commonly Used Surface Treatment Processes for Anticorrosive Coatings
Release time:
2021-11-12
When steel products come into long-term contact with the atmosphere or undergo heat treatment, their surface will be covered with a layer of rust or black oxide skin, and their chemical composition is various iron oxides. When carrying out various surface treatments, these oxides must be removed in advance. The methods include manual rust removal, mechanical rust removal, and sandblasting rust removal, and the most common method is to use various acid reagents for rust removal.
When steel products come into long-term contact with the atmosphere or undergo heat treatment, their surface will be covered with a layer of rust or black oxide skin, and their chemical composition is various iron oxides. When carrying out various surface treatments, these oxides must be removed in advance. The methods include manual rust removal, mechanical rust removal, and sandblasting rust removal, and the most common method is to use various acid reagents for rust removal. The essence of this treatment is to clean the rust from the metal surface through the dissolution effect of acids on the rust, as well as the mechanical peeling effect of hydrogen gas generated by the reaction between acids and the metal substrate during the treatment process. The process of removing a large amount of oxide on the surface with acids is called strong etching, or acid washing, while the process of removing thin oxide films on the surface that are not easily visible to the naked eye is called weak etching. Sometimes during the etching process, an electric current is also applied, which is called electrochemical etching. Electrochemical etching is used for both strong and weak etching, and weak etching is generally carried out before entering the electroplating tank after strong etching. After this process, metal products are not allowed to stay in the atmosphere for too long, especially the surface of metal products should not be in a dry state. To ensure the smooth progress of the etching process, oil must be removed before etching, otherwise the acid and metal oxide cannot fully contact, which will inhibit the chemical dissolution reaction.
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