Phosphating process for steel pipe

A process and steel pipe technology, which is applied in the phosphating process of steel pipes, can solve the problems of high temperature in the processing workshop, large energy consumption, and harsh working environment for the staff

Active Publication Date: 2019-10-22
浙江丰业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above technical solution, the phosphating process needs to be carried out under the heating condition of 50-75°C. On the one hand, it consumes a lot of energy, and on the other hand, it leads to a higher temperature in the processing workshop, which makes the working environment of the staff worse. ,Room for improvement

Method used

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  • Phosphating process for steel pipe
  • Phosphating process for steel pipe
  • Phosphating process for steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A phosphating process for steel pipes, such as figure 1 shown, including the following steps:

[0043] S1, degreasing and derusting treatment;

[0044] S2, washing with water;

[0045] S3, phosphating treatment;

[0046] S4, dry;

[0047] In terms of parts by weight, the components of each liter of phosphating solution are shown in Table 1, and the pH is adjusted to 2.0 with ammonia water.

[0048] Wherein, the phosphating aid adopts citric acid.

Embodiment 2

[0050] The difference from Example 1 is that, in terms of parts by weight, the components of each liter of phosphating solution are shown in Table 1, and ammonia water is used to adjust the pH to 3.0.

Embodiment 3

[0052] The difference from Example 1 is that, in terms of parts by weight, the components of each liter of the phosphating solution are shown in Table 1, and ammonia water is used to adjust the pH to 3.5.

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PUM

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Abstract

The invention discloses a phosphating process for a steel pipe and relates to a treatment process for the steel pipe. The treatment process comprises the following steps: S1, oil and rust removing treatment; S2, washing; S3, phosphating treatment; S4, drying. Each liter of phosphating solution is prepared from the following components in parts by weight: 30 to 40 parts of phosphoric acid, 20 to 25parts of zinc oxide, 0.2 to 0.3 part of sodium chlorate, 0.2 to 0.3 part of sodium molybdate, 0.2 to 0.4 part of m-nitrobenzenesulfonic acid sodium, 0.5 to 1.0 part of phosphating additive, and ammonium hydroxide of which the pH is adjusted to 2.0 to 3.5. The phosphating process disclosed by the invention has the advantages that the phosphating process can be performed at normal temperature by cooperating all the components in a system; and in addition, the phosphating solution does not contain harmful substances such as nitrate, nitrite and heavy metal, and has no pollution to the operationenvironment or no harm to operators.

Description

technical field [0001] The invention relates to a steel pipe treatment process, more specifically, it relates to a steel pipe phosphating process. Background technique [0002] Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The purpose of phosphating is mainly to provide protection for the base metal and prevent the metal from being corroded to a certain extent; it is used as a primer before painting to improve the adhesion and anti-corrosion ability of the paint film layer. [0003] The Chinese patent with the publication number CN109013704A discloses a seamless steel pipe manufacturing process, which includes the following steps: a. heating; b. perforation; c. pickling treatment: pickling the pipe material with pickling solution; d. Phosphating treatment: In the step of carrying out phosphating treatment on the pipe material after pic...

Claims

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Application Information

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IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 冯佩姜方武陈晓和
Owner 浙江丰业集团有限公司
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