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Steel pipe alramenting technology

A technology of surface phosphating and steel pipe, applied in the direction of metal material coating process, etc., can solve the problems of high risk and working environment pollution, and achieve the effect of reducing environmental pollution, low risk and easy operation.

Inactive Publication Date: 2014-04-16
CHANGSHU DONGXIN STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphating solution used in traditional zinc-based phosphating is made of ZnO, HNO3 and H3PO4. HNO3 and HNO3 are high-risk chemical products, and they are highly risky and pollute the working environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A steel pipe surface phosphating process, the loading density of the steel pipe in the phosphating process is 0.040 square meters per liter, and the phosphating solution consists of 100g / L zinc oxide, 110g / L zinc nitrate and 80g / L Composed of orthophosphoric acid, the total acidity of the phosphating solution is 20 points, the free acidity of the phosphating solution is 5 points, the phosphating temperature is 80°C, and the treatment time is 30 minutes.

Embodiment 2

[0011] A steel pipe surface phosphating process, the loading density of the steel pipe in the phosphating process is 0.060 square meters per liter, and the phosphating solution consists of 110g / L zinc oxide, 120g / L zinc nitrate and 90g / L Composed of orthophosphoric acid, the total acidity of the phosphating solution is 21 points, the free acidity of the phosphating solution is 6 points, the phosphating temperature is 85°C, and the treatment time is 35 minutes.

Embodiment 3

[0013] A steel pipe surface phosphating process, the loading density of the steel pipe in the phosphating process is 0.050 square meters per liter, and the phosphating solution consists of 108g / L zinc oxide, 113g / L zinc nitrate and 86g / L Composed of orthophosphoric acid, the total acidity of the phosphating solution is 20.5 points, the free acidity of the phosphating solution is 5.5 points, the phosphating temperature is 83°C, and the treatment time is 34 minutes.

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PUM

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Abstract

The invention discloses a steel pipe alramenting technology. In the phosphating process, the loading density of a steel pipe is 0.040-0.060 m<2> / L; a phosphating solution comprises zinc white of 100-100 g / L, zinc nitrate of 110-120 g / L and orthophosphoric acid of 80-90 g / L; the total acidity of the phosphating solution is 20-21 points, the free acidity of the phosphating solution is 5-6 points, the phosphating temperature is 80-85 DEG C, and the processing time is 30-35 minutes. Through the adoption of the steel pipe alramenting technology, the environmental pollution is reduced, the risk is low, and the operation is easy.

Description

technical field [0001] The invention relates to a steel pipe surface phosphating process. Background technique [0002] The phosphating solution used in the phosphating process is divided into zinc-based, zinc-calcium-based, zinc-manganese-based, manganese-based, etc. The phosphating film is used for anti-friction lubrication in the metal cold processing process. The phosphating solution used in traditional zinc-based phosphating is made of ZnO, HNO3 and H3PO4. HNO3 and HNO3 are high-risk chemical products with strong risks and great pollution to the working environment. Contents of the invention [0003] The purpose of the present invention is to provide a steel pipe surface phosphating process, which reduces environmental pollution, has low risk and is easy to operate. [0004] In order to achieve the above object, the technical solution of the present invention is to design a steel pipe surface phosphating process, the loading density of the steel pipe in the process o...

Claims

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Application Information

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IPC IPC(8): C23C22/07
Inventor 须晓东
Owner CHANGSHU DONGXIN STEEL PIPE
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