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Self-repairing normal temperature blackening agent for cold-drawn steel pipes and its preparation method and application

A cold-drawn steel pipe, self-repairing technology, applied in the direction of metal material coating process, can solve the problems of high cost, complicated process and increased operation complexity.

Active Publication Date: 2021-11-02
HUNAN JINHUA SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the blackening agents contain phosphorus, selenium, nitrite and other polluting substances or the process is complicated and the cost is high, and after blackening the cast iron, in order to prevent the surface from rusting, it is necessary to immerse another kind of blackening agent. Anti-rust treatment in a solvent cannot achieve the function of blackening and anti-rust at the same time, which increases the complexity of the operation
How to improve the overall performance of the blackening film, especially the anti-rust performance, and how to solve the serious corrosion problem at the scratches of the cold-rolled steel pipe during transportation have become new topics. However, there are no results on self-repairing normal temperature blackening agents. to report

Method used

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  • Self-repairing normal temperature blackening agent for cold-drawn steel pipes and its preparation method and application
  • Self-repairing normal temperature blackening agent for cold-drawn steel pipes and its preparation method and application
  • Self-repairing normal temperature blackening agent for cold-drawn steel pipes and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] component name parts by weight Copper Sulfate Pentahydrate 10 Ammonium tungstate 300 Sodium lignosulfonate doped polyaniline reaction solution 700 nickel sulfate 50 ammonium thiosulfate 80 trisodium nitrilotriacetate 40

[0026] The sodium lignosulfonate doped polyaniline reaction solution used above can be synthesized by the following method:

[0027] One, take by weighing 13-24 parts by weight (such as can be 18.6 parts by weight) sodium lignosulfonate, pour it into (0.8-1.2) mol / L of 70-130 parts by weight (such as can be 100 parts by weight) In the sulfuric acid solution (the concentration of sulfuric acid solution is preferably 1mol / L), fully stir and mix evenly, then take 13-24 parts by weight of aniline (for example, it can be 18.6 parts by weight), slowly add in the mixed solution under the action of stirring, fully Stir and mix evenly to prepare liquid D.

[0028] Two, take by weighing the ammonium persulfate ...

Embodiment 2

[0032] Embodiment 2 is compared with embodiment 1, only the proportioning of each component changes to some extent, and the proportioning of each component in embodiment 2 is as follows:

[0033]

[0034]

Embodiment 3

[0036] Embodiment 3 compares with embodiment 1 and 2, only the mass percent distribution ratio of each component changes, and the proportioning of each component in embodiment 3 is as follows:

[0037] component name parts by weight Copper Sulfate Pentahydrate 100 Ammonium tungstate 200 Sodium lignosulfonate doped polyaniline reaction solution 50 nickel sulfate 5 ammonium thiosulfate 10 trisodium nitrilotriacetate 5

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Abstract

The self-repairing normal-temperature blackening agent for cold-drawn steel pipes and its preparation method and application relate to the technical field of metal surface treatment, wherein the main film-forming substances of the aforementioned self-repairing normal-temperature blackening agent for cold-drawn steel pipes include Copper sulfate pentahydrate, ammonium tungstate and sodium lignosulfonate doped polyaniline reaction solution. The blackening agent can achieve blackening and rust prevention at the same time, and the blackening film has a self-repairing function. Compared with the blackening film formed by the traditional room temperature blackening agent, the blackening film layer has better corrosion resistance. More than ten times the improvement, the market application prospect is extremely broad.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a self-repairing normal-temperature blackening agent for cold-drawn steel pipes and a preparation method and application thereof. Background technique [0002] The blackening treatment of cold-drawn steel pipe is a surface treatment technology used to improve the corrosion resistance of steel pipes, and the blackening agent is a chemical agent to realize the blackening treatment of steel. [0003] At present, the commonly used blackening methods are: alkaline chemical oxidation and acidic chemical oxidation (blackening at room temperature). The alkaline chemical oxidation method is treated at a high temperature of 135-150 ° C for 30-90 minutes. The film layer is fine, uniform, bright black, high fastness, and good corrosion resistance; but there are long production cycles, high energy consumption, and poor working conditions. , the serious problem of environmenta...

Claims

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Application Information

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IPC IPC(8): C23C22/05
CPCC23C22/05
Inventor 任振兴彭庆华彭云唐鹏飞赵端泉
Owner HUNAN JINHUA SCI & TECH GRP
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