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Stable and high-efficient room-temperature black phosphating presoak

A technology of pre-soaking solution and normal temperature, applied in the field of surface chemistry, can solve the problems of easy film peeling, easy film removal, low corrosion resistance, etc., and achieve the effects of low environmental pollution, wide adaptability and high corrosion resistance

Inactive Publication Date: 2017-10-13
ANHUI JIANGNAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the prepregs currently on the market are extremely unstable and easy to drop the film, which will cause the solution to change easily, reduce the reuse rate of the solution, and cause problems such as waste liquid treatment and recycling.
Coupled with the disadvantages of slow reaction and high cost, the phosphating film formed has poor blackness, easy stripping, and low corrosion resistance, which is far from meeting the high-quality requirements of modern industrial products.
The development of prepreg has seriously hindered the widespread application of black phosphating technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] A stable and efficient room temperature black phosphating presoak solution, each liter of the treatment solution is composed of a mixture of the following raw materials:

[0018] 2g of blackening agent, 0.5g of blackening aid, 2g of stabilizer, 1g of accelerator, and the balance is water;

[0019] The blackening agent is made up of the following raw materials in parts by weight: 35 parts of 65% nitric acid are slowly added to 48 parts of purified water under constant stirring, and then 6 parts of bismuth nitrate are slowly added to the above-mentioned In dilute nitric acid solution, react at room temperature for 120-150 minutes, apply ultrasonic waves with a power of 80W and stir simultaneously during the reaction process, and after the reaction is completed, solution a is obtained;

[0020] Described blackening auxiliary agent is the mixture of one or more in copper nitrate, copper carbonate, copper sulfate;

[0021] The stabilizer is composed of the following raw mat...

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Abstract

The invention discloses a stable and high-efficient room-temperature black phosphating presoak. Each liter of the presoak comprises the following raw materials by weight: 1-10 g of a blackening agent, 0.1-1 g of a blackening assistant, 0.5-5 g of a stabilizer, 1-5 g of an accelerant and the balance of water. The presoak can be applied on the surface of steel, so that blackness is high; a film layer binding force is firm; and the appearance is uniform. Besides, a conversion film is of a compact crystalline structure, so that the corrosion resistance of the phosphating conversion film can be greatly improved by the presoak; and besides, the presoak is extremely stable and high in treatment capacity, does not contain nickel, nitrites and other toxic or harmful substance and thus is low-pollution to the environment.

Description

technical field [0001] The invention mainly relates to the field of surface chemistry, in particular to a stable and efficient normal-temperature black phosphating predipping solution. Background technique [0002] Black phosphating is a widely used low-cost and high-quality surface treatment technology. Under industrial atmospheric environment and marine climate conditions, its corrosion resistance is several times higher than that of ordinary phosphating film, dozens of times higher than that of oxide film and normal temperature blackened film, showing excellent corrosion resistance and excellent black appearance color. Moreover, this film layer also has properties such as light absorption, heat absorption, and insulation. In addition, the iron and steel black phosphating process has advanced technical and economic indicators such as low production cost, good product quality, and low energy saving and pollution. At present, some aviation, electronics, weapons, ships, au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/36
CPCC23C22/36C23C22/78
Inventor 王成林
Owner ANHUI JIANGNAN MACHINERY
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