One-step oil-removal rust-removal phosphatization technology of steel workpiece

A workpiece and process technology, applied in the field of one-step degreasing and derusting phosphating process of iron and steel workpieces, can solve problems such as difficulty in maintaining the concentration of phosphating solution components, long phosphating film formation time, and large changes in phosphating solution components , to achieve the effects of easy treatment and regeneration, easy mechanization and automation, and less sediment

Inactive Publication Date: 2014-12-31
WUXI LUOSHE TECH VENTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Publication number CN85100689A "a kind of derusting phosphating solution", CN1030947A "degreasing and derusting phosphating solution", CN1038470A "iron and steel surface treatment agent-a new type of derusting and antirusting agent" are all composed of phosphoric acid, trisodium phosphate, chromic acid, surface Activator, etc. This kind of phosphating solution has the advantages of rust removal, oil removal and rust removal or rust removal and anti-rust. The phosphating of iron and steel workpieces is treated at 30-65°C. Dry in air and continue natural phosphating. Although this phosphating solution solves the problem of reducing residues, the phosphating treatment of steel workpieces before coating still needs to be heated, and after natural air-dry phosphating, the phosphating film takes a long time to form. In the case of high ambient humidity, iron and steel workpieces are prone to yellowing and rusting problems. During the phosphating process of iron and steel workpieces, the composition of the phosphating solution changes greatly, and it is difficult to maintain the concentration of the phosphating solution components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A one-step degreasing and derusting phosphating process for iron and steel workpieces. The phosphating solution used in the process consists of: 85% phosphoric acid 165g / L, nickel dihydrogen phosphate 28g / L, zinc dihydrogen phosphate 14g / L, dihydrogen phosphate Hydrogen cobalt 8g / L, sodium chlorate 6g / L, sodium m-nitrobenzenesulfonate 4g / L, yellow blood salt 2g / L, ammonium molybdate 3g / L, thiourea 2g / L, tartaric acid 15g / L, OP -106g / L, and the balance is water; the phosphating process is as follows: the above components are prepared into a phosphating solution, so that its free acidity is 14-20, and the total acidity is 200-240, so that the temperature of the phosphating solution is kept At 15°C, put the iron and steel workpiece into the phosphating solution for 35 minutes, then take it out and dry it in a ventilated place.

Embodiment 2

[0017] A one-step degreasing and derusting phosphating process for iron and steel workpieces. The phosphating solution used in the process consists of: 85% phosphoric acid 175g / L, nickel dihydrogen phosphate 22g / L, zinc dihydrogen phosphate 18g / L, dihydrogen phosphate Hydrogen cobalt 6g / L, sodium chlorate 8g / L, sodium m-nitrobenzenesulfonate 2g / L, yellow blood salt 4g / L, ammonium molybdate 1g / L, thiourea 4g / L, tartaric acid 11g / L, OP -1010g / L, and the balance is water; the phosphating process is as follows: the above components are prepared into a phosphating solution, so that its free acidity is 14-20, and the total acidity is 200-240, so that the temperature of the phosphating solution is kept At 35°C, put the iron and steel workpiece into the phosphating solution for 25 minutes, then take it out and dry it in a ventilated place.

Embodiment 3

[0019] A one-step degreasing and derusting phosphating process for iron and steel workpieces. The phosphating solution used in the process consists of: 85% phosphoric acid 170g / L, nickel dihydrogen phosphate 25g / L, zinc dihydrogen phosphate 16g / L, dihydrogen phosphate Hydrogen cobalt 7g / L, sodium chlorate 7g / L, sodium m-nitrobenzenesulfonate 3g / L, yellow blood salt 3g / L, ammonium molybdate 2g / L, thiourea 3g / L, tartaric acid 13g / L, OP -108g / L, and the balance is water; the phosphating process is as follows: the above-mentioned components are prepared into a phosphating solution, so that its free acidity is 14-20, the total acidity is 200-240, and the temperature of the phosphating solution is kept At 25°C, put the iron and steel workpiece into the phosphating solution for 30 minutes, then take it out and dry it in a ventilated place.

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Abstract

The invention discloses a one-step oil-removal rust-removal phosphatization technology of a steel workpiece. A phosphatization liquid used by the one-step oil-removal rust-removal phosphatization technology comprises 165-175g/L of phosphoric acid having a concentration of 85%, 22-28g/L of nickel dihydrogen phosphate, 14-18g/L of zinc dihydrogen phosphate, 6-8g/L of cobalt dihydrogen phosphate, 6-8g/L of sodium chlorate, 2-4g/L of sodium 3-nitrobenzene sulfonate, 2-4g/L of potassium ferrocyanide, 1-3g/L of ammonium molybdate, 2-4g/L of thiourea, 11-15g/L of tartrate, 6-10g/L of OP-10 and the balance water. The one-step oil-removal rust-removal phosphatization technology comprises the following steps of preparing the phosphatization liquid from the above components, adjusting free acidity to 14-20 and total acidity to 200-240, keeping a temperature of the phosphatization liquid in a range of 15-35 DEG C, putting a steel workpiece into the phosphatization liquid for phosphatization treatment for 25-35min, taking out the treated steel workpiece and carrying out airing in a ventilated place.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a one-step degreasing and descaling phosphating process for iron and steel workpieces. Background technique [0002] After the chemical reaction between the metal and phosphoric acid or phosphate, a stable phosphating film with a thickness of several microns can be formed on the metal surface, and the phosphating film provides protection for the metal substrate, that is, improving the corrosion resistance and wear resistance of the metal. Moreover, the phosphating film can also withstand short-term high-temperature baking above 400 °C, and can ideally improve the adhesion of the metal surface coating layer, and play the role of anti-friction and lubrication in the metal cold processing process. [0003] Publication number CN1283710A discloses a kind of "phosphating solution and phosphating process for steel cold deformation processing", publication number CN1115794A dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42C23G1/08
Inventor 高忠清
Owner WUXI LUOSHE TECH VENTURE
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