Steel plate workpiece spraying and coating pretreatment spray-type normal temperature phosphating agent and preparation method thereof

Abstract

The invention relates to a steel plate workpiece spraying and coating pretreatment spray-type normal temperature phosphating agent which comprises the raw materials by mass percent: 8-48% of phosphoric acid, 0.5-2% of zinc oxide, 0.5-2% of tartaric acid, 0.5-1% of citric acid, 0.1-0.8% of nickel nitrate, 0.1-0.8% of potassium nitrate, 0.1-0.3% of thiourea, 0.5-1.5% of ethylene glycol monobutyl ether, 0.5-1.5% of isopropyl alcohol and the rest of tap water. A preparation method comprises: adding the metered tap water into a special reaction kettle, starting a stirrer under the normal temperature and pressure, and stirring at the rotating speed of 150-250r / min; then, sequentially adding the potassium nitrate, the nickel nitrate, the thiourea, the tartaric acid and the citric acid while stirring, slowly adding the phosphoric acid when the raw materials are fully dissolved, fully stirring for 25-35min, and then slowly adding the zinc oxide and stirring until the mixture is completely dissolved; and finally, sequentially adding the ethylene glycol monobutyl ether and the isopropyl alcohol, continuously stirring for 50-70min, and checking by sampling and packaging until the solution is even light green transparent liquid.

Description

technical field [0001] The invention relates to a phosphating agent and a preparation method thereof, in particular to a spray-coating type normal-temperature phosphating agent and a preparation method thereof for pretreatment of steel plate workpiece spraying and coating. Background technique [0002] The use of phosphating technology to spray and pre-coat steel plate workpieces is the basis of workpiece spraying. The quality of the phosphating film has a great influence on the performance of the sprayed coating. The appearance of the normal phosphating film should be a light gray film with fine crystals, dense, uniform, no rust, and no sediment deposits. Its main functions: one is to improve the comprehensive anti-rust and corrosion resistance of the overall coating; the other is to enhance the adhesion between the sprayed coating layer and the steel substrate, and give the sprayed coating layer sufficient mechanical strength. This is because the phosphating film and the ...

AI Technical Summary

Problems solved by technology

The most prominent shortcoming of the currently used phosphating agent in the production line is the heating of the whole line. The problem caused by heating is energy consumption and waste in many aspects. The evaporation of the working fluid and the accelerated formation of sediment are also a waste of raw materials. At the same time, it will pollute the working environment and affect the physical and mental health of operators.

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