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Triple cationic phosphorizing fluid containing calcium, zinc and manganese for steel plate and zinc-coated plate treatment

A zinc-manganese ternary cation and galvanized sheet technology, which is applied in the coating process of metal materials, can solve the problems of hexavalent chromium hazards and restrictions on the use of chromate, and achieve rapid formation, fine crystallization, and alkali resistance of the film layer sex high effect

Inactive Publication Date: 2007-09-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toxicity of hexavalent chromium has serious harm to the environment and human body, and the use of chromate has been strictly restricted.

Method used

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  • Triple cationic phosphorizing fluid containing calcium, zinc and manganese for steel plate and zinc-coated plate treatment
  • Triple cationic phosphorizing fluid containing calcium, zinc and manganese for steel plate and zinc-coated plate treatment
  • Triple cationic phosphorizing fluid containing calcium, zinc and manganese for steel plate and zinc-coated plate treatment

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1: the phosphating solution is composed of, water is the solvent, 5 g of calcium nitrate, 10 g of manganese acetate, 2 g of zinc nitrate, 20 g of phosphoric acid or calcium dihydrogen phosphate, 5 g of sodium nitrate, and 10 g of accelerator citric acid are added in every liter of the phosphating solution ; When used for the surface treatment of electro-galvanized steel sheets, the pH value is 2-4, the temperature is 40-60°C, and the treatment time is 2-10 minutes, and a uniform and fine phosphating film can be formed on the galvanized steel sheets.

Embodiment 2

[0047] Embodiment 2: the phosphating solution is composed of, water is a solvent, calcium nitrate 60g is added in every liter of phosphating solution, manganese acetate 0.5g, zinc nitrate 35g, phosphoric acid or calcium dihydrogen phosphate 5g, sodium nitrate 30g, accelerator chloric acid Sodium 0.5g; when used for the surface treatment of electro-galvanized steel sheets, the pH value is 2-4, the temperature is 40-60°C, the sample is a steel plate, and the treatment time is 3-10 minutes, and a uniform phosphating film can be formed on the surface of the steel plate .

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Abstract

A phosphorizing liquid contains calcium, zinc and manganese triple cation for steel plate and zinc-plated plate treatment consists of calcium salt 5-60g, manganese salt 0.5-10g, zinc salt 2-35g, phosphate 5-20g, nitrate 5-30g and improver 0.5-10g. It hasn't Cr6+ and heavy metal ion Ni2+ and no environmental pollution, and it can be used with cathode electrophoresis. It's simple, cheap, has excellent alkali-resistance and homogeneous crystal grain.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a Ca-containing 2+ , Zn 2+ , Mn 2+ Ternary cationic phosphating solution. Background technique [0002] With the rapid development of the automobile industry, the demand and requirements for the surface treatment technology of environmentally friendly steel sheets and galvanized sheets have increased. The potential of zinc is negative than that of iron. In industry, electroplating and hot dipping are often used to deposit zinc on the surface of steel, and the substrate is protected by a sacrificial anode of zinc. Due to the stamping processability, weldability, adhesion to paint film and corrosion resistance before and after deformation of galvanized steel sheets, the service life of steel is greatly extended. Galvanized steel sheets have been widely used in automobiles, home appliances, chemicals, aviation, etc. And other fields, especially electro-galvanized steel sheet has be...

Claims

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Application Information

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IPC IPC(8): C23C22/08
Inventor 刘娅莉戴崇良李智吴绍强
Owner HUNAN UNIV
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