Method for preparing silicon oxide ceramic coatings on steel member through electrophoretic deposition

Abstract

The invention discloses a method for preparing silicon oxide ceramic coatings on surfaces of Fe, Cu, Zn, Ni, Sn and their alloy through electrophoretic deposition. The method comprises the following steps: carrying out dark nickel electroplating or composite nickeling, or phosphorizing with above metals as electrophoretic silicon oxide coating matrixes, nickel sulfate as a main salt, nickel chloride as an anodic activator, boric acid as a buffering agent and Al2O3 as a powder body; carrying out electrophoretic deposition on the nickeled or phosphorized metal matrixes in a prepared silicon oxide sol; drying the matrixes; and sintering the matrixes to obtain the silicon oxide ceramic coatings. The method provided in the invention, which uses the electrophoretic deposition, has the characteristics of simple technology and no need of expensive or complex devices, and the prepared ceramic coatings have better compactness than pulled films, and have good performances and uniform components. The method can be used for preparing wear resistant coatings and high temperature oxidation resistant coatings on surfaces of metals especially common steel and above metals, can substitute hard chromium electroplating technologies with severe pollutions, and has the advantages of cleanness, no pollution and easy industrialization realization.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, and relates to a method for preparing a silicon oxide ceramic coating by electrophoretic deposition technology, in particular to a method for preparing a silicon oxide ceramic coating by electrophoretic deposition on a steel piece. Background technique [0002] Surface modification technology can improve the surface properties of metal materials, prevent or delay the failure of workpieces, and prolong the service life of workpieces and equipment, which has huge economic benefits. Ceramic materials have high hardness, good wear resistance, corrosion resistance and high temperature oxidation resistance. The preparation of ceramic coatings on metal surfaces can combine the above advantages of ceramic materials with the advantages of high plasticity and toughness of metal materials to obtain workpieces with good comprehensive properties. At present, steel-based ceramic coating preparation techn...

AI Technical Summary

Problems solved by technology

However, preparing ceramic coatings directly on carbon steel, stainless steel, and low-alloy steel substrates has technical difficulties such as weak film / substrate bonding and easy peeling off. Generally, appropriate pretreatment is required to prepare a transition layer.