Normal temperature leather diaphragm passivating agent before spraying and coating steel workpiece and preparation method thereof

Abstract

The invention relates to a normal temperature leather diaphragm passivating agent before spraying and coating a steel workpiece, comprising the raw materials by mass percent: 2-8% of phytic acid, 0.1-3% of tartaric acid, 0.3-2% of citric acid, 2-6% of sodium benzoate, 4-8% of triethanolamine and the rest of tap water. A preparation method comprises: adding the metered tap water into a reaction kettle, starting a stirrer under the normal temperature and pressure, and stirring at the speed of 450-550r / min; then, sequentially adding the tartaric acid, the sodium benzoate, the triethanolamine, the citric acid and the phytic acid, continuously stirring for 20-40min after adding every material, and continuously stirring for 0.5-1.5h after adding all the materials; and finally, checking by sampling and packaging until the solution in the reaction kettle is even light purple transparent water-soluble liquid. The passivating agent can be used under the condition of normal temperature, and has the advantages of simple technique, convenient operation, no need for a heating device, low production cost, no pollution, simple technology of the preparation method, easy control and convenient operation.

Description

technical field [0001] The invention relates to a passivating agent and a preparation method thereof, in particular to a normal temperature skin film passivating agent before spraying and coating of iron and steel workpieces and a preparation method thereof. Background technique [0002] Steel workpieces generally undergo chemical treatment before spraying and coating to form a protective film on the surface. The film is usually only a few microns. The main functions of this film are: one is to improve the overall corrosion resistance, and the other is to strengthen the steel workpiece. The adhesion between the material and the coating is low, because the porosity of the protective film allows the coating to penetrate into these pores, so that the tight combination of the coating layer and the protective film is achieved and the adhesion is improved. [0003] With the rapid development of automobiles, refrigerators, washing machines and other home appliance industries and th...

AI Technical Summary

Problems solved by technology

The passivating agent used in this process contains PO 4 -3 、Cr +6 , heavy metal salts and other highly toxic and highly polluting substances, causing serious pollution to the environment; the high temperature in the process requires heating equipment, which complicates the process equipment and wastes energy