Anti-corrosion spraying method for inner wall of chemical storage tank

Abstract

The invention provides a corrosion preventive coating method of an inner wall of a storing tank of chemical engineering. The method comprises the following steps: 1) blasting sand on the surface of the inner wall of a tank body; and parkerising and passivating the sand blasted tank body; 2) coating the sand-blasted, parkerised and passivated surface of the tank body with metal powder; roasting the coating under high temperature; and leveling and curing to form a metal powder bottom layer; 3) coating a primer layer on the surface of the metal powder bottom layer; 4) coating an intermediate paint layer on the surface of the primer layer; and 5) coating finish paint on the surface of the intermediate paint layer. According to the method, the treatment technologies of parkerising and passivating the surface of the inner wall of the tank body and coating the metal powder coating are added after sand blasting treatment; the parkerising and passivating treatment is carried out, so that the pickling step performed after a traditional sand blasting technology is avoided, minute sharp corners on the surface subjected to sand blasting treatment are decreased, and the continuity of a foundation corrosion preventive coating is ensured; in addition, the metal powder coating is high in mechanism strength, high in adhesion capacity, outstanding in corrosion and ageing resistance, and capable of effectively transferring static electricity produced by petrochemical mediums in flowing, and realizes electrochemical protecting effect.

Description

technical field [0001] The invention belongs to the technical field of tank body anticorrosion spraying technology, and in particular relates to an anticorrosion spraying method for the inner wall of a chemical storage tank. Background technique [0002] Chemical storage tanks are used to transport or store chemical products, and have high requirements for acid resistance, alkali resistance, anti-corrosion, and anti-static properties. Otherwise, the strength may decrease due to accelerated corrosion, shorten the service life, and may even cause leakage or collapse of the tank, etc. Therefore, it is necessary to conduct a comprehensive analysis of the corrosion factors of chemical storage tanks. From the beginning of tank construction, select the best anti-corrosion coatings, adopt new processes, and strengthen anti-corrosion construction management. [0003] However, the existing chemical storage tanks are usually coated with a layer of zinc-rich or epoxy-based primers and t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor anticorrosion effect of the anticorrosion coating process of existing chemical storage tanks

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