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Iron and steel surface sensitizing and blackening agent and relevant blackening process

A technology of steel surface and process method, applied in the direction of metal material coating process, etc., can solve the problems of low corrosion resistance, toxic blackening liquid, insufficiently stable surface film adhesion, etc., and achieve stable film composition and adhesion. Good, fast film forming effect

Inactive Publication Date: 2003-11-05
LIUZHOU OVM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problems that the existing iron and steel blackening agent at room temperature is toxic or the blackening solution is not stable enough, and the surface film layer adhesion and corrosion resistance caused by blackening are poor, and to provide a , the surface blackening process and discharge pollution-free, the solution has no peculiar smell, and is non-toxic and harmless to the human body. The steel surface sensitization rapid blackening agent and the blackening process using the sensitization blackening agent

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  • Iron and steel surface sensitizing and blackening agent and relevant blackening process

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Embodiment

[0038] A normal temperature iron and steel surface sensitizing blackening agent, comprising a sensitizing liquid and a normal temperature blackening liquid, the formulas are as follows:

[0039] ① Sensitizing solution:

[0040] CuSO 4 ·5H 2 O: 4~10g / l NiSO 4 ·7H 2 O: 1~5g / l

[0041] Sodium citrate: 4~10g / l Tartaric acid: 4~10g / l

[0042] Sulfamic acid: 4~10g / l H 2 O: margin

[0043] pH=2~4

[0044] ②Normal temperature blackening liquid:

[0045] Sodium sulfide: 40~100g / l Ethanol: 20~50ml / l

[0046] H 2 O: margin

[0047] pH=8~10

[0048] A process method for using the above-mentioned normal temperature iron and steel surface sensitizing blackening agent for iron and steel surface blackening, which is characterized in that it includes the following processes:

[0049] ①Pretreatment: degreasing, pickling and rinsing the surface of steel parts;

[0050] ② Sensitization: immerse the pretreated steel piece in the sensitizing solution of the normal tempe...

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Abstract

The iron and steel surface sensitizing and blackening agent includes sensitizing agent and normal temperature blackening liquid. Its formula is as follows: the sensitizing agent consists of CuSO4.5H2O, NiSO4.7H2O, sodium citrate, tartaric acid, amido sulfonic acid and water, and has pH value of 2-4; and the normal temperature blackening liquid consists of sodium sulfide, ethanol and water, and has pH value of 8-10. The blackening process includes the main steps of: pre-treatment of iron and steel parts, soaking the pre-treated iron and steel parts in the sensitizing agent liquid for 2-6 to sensitize, and soaking the sensitized and washed iron and steel parts in the normal temperature blackening liquid for 3-5 min to form black film.

Description

1. Technical Field: [0001] The invention relates to the technical field of chemical treatment of metal surfaces, in particular to a non-toxic steel normal temperature blackening agent for chemical oxidation and blackening of the steel surface and a blackening process method using the blackening agent. 2. Background technology: [0002] The technology of forming an oxide film on the surface of steel through a blackening agent is widely used in machinery, weapons, clocks and other industries. Traditional steel blackening is carried out in alkaline sodium nitrite solution at 135~150℃, which has long processing time, high energy consumption, heavy pollution, low efficiency, poor working environment, which is extremely harmful to the operator's body; In recent years, many researchers have carried out research work on the iron and steel blackening process at room temperature, and introduced a variety of blackening agents and blackening processes, but most of the blackening agents devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
Inventor 梁来黄激扬杨庆李炎德吕行赖祥智
Owner LIUZHOU OVM MASCH CO LTD
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