A method for preparing composite phosphating film by doping inorganic nanoparticles

A technology of inorganic nanoparticles and phosphating film, applied in the field of material science and surface, can solve the problems affecting the quality, output and cost of coating production, poor quality of phosphating film, high cost, etc., and achieve excellent oxidation resistance and chemical Stability, reduction of phosphating treatment temperature, effect of film hardness improvement
CN109609937BActive Publication Date: 2020-05-22SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2020-05-22

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Abstract

The invention discloses a method of preparing a composite phosphating film by doping inorganic nanoparticles. The method comprises the following steps that the components of, by mass 5-8 parts of phosphate, 7-9 parts of zinc, manganese or calcium salt, 0.6-3 parts of phosphoric acid, 0.04-0.4part of boron nitride, 0.1-1 part of a stabilizer, 6-10 parts of a pH buffer agent, 80-100 parts of water are put into a reaction kettle, and the pH value is adjusted to 2-3 by using an alkali solution, then temperature is heated to 20-40 DEG C, and mechanically stirring and discharging kettle are carriedout; and then a prepared phosphating treatment solution is placed into a phosphating tank, the temperature of the phosphating treatment is increased to 20-40 DEG C, then a steel test piece after rustremoval and oil removal is immersed into the phosphating tank, and after the steel test piece is treated, the steel test piece is washed by water and aired. According to the method, the boron nitrideis used as a nucleation adsorption site of crystal during phosphorization, so that crystal adhesion is facilitated, and a composite phosphating film is formed, the boron nitride is a hydrophobic nanomaterial, the dense composite phosphating film can effectively prevent the permeation of the water in air, and corrosion resistance is excellent.
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Description

Technical field

[0001] The invention relates to a phosphating film, in particular to a method for preparing a phosphating film by doping nano boron nitride; it belongs to the field of material science and surface technology. Background technique

[0002] After the metal surface is degreasing and derusting, in order to prevent re-rusting, chemical treatment is usually carried out to form a protective film on the metal surface. Phosphating is a commonly used surface treatment technology, which refers to the process of forming a hardly water-soluble phosphate film on the metal surface through a chemical reaction in a specific acid phosphate solution. According to the type of phosphating film, phosphating can be divided into six categories: zinc series, zinc calcium series, zinc manganese series, manganese series, iron series, and amorphous iron series. It should be pointed out that although the phosphating film is thin, because it is a non-metallic non-conductive isolation layer, i...

Claims

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