Black chemical oxidation liquid for steel and application of black chemical oxidation liquid

A chemical oxidation and black technology, which is applied in the coating process of metal materials, etc., can solve the problems of high energy consumption, serious human injury, environmental pollution, etc., and achieve the effects of high film forming efficiency, easy operation, and process optimization

Inactive Publication Date: 2017-05-31
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of serious environmental pollution, great harm to the human body and high energy consumption in the existing iron and steel black chemical oxidatio

Method used

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  • Black chemical oxidation liquid for steel and application of black chemical oxidation liquid
  • Black chemical oxidation liquid for steel and application of black chemical oxidation liquid
  • Black chemical oxidation liquid for steel and application of black chemical oxidation liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0025] Examples 1-7: Experiments on black chemical oxidation solutions containing different additives and their blackening effects.

[0026]

[0027]

[0028] In order to determine the optimal components of the additives in the formulation, 7 additives with the same dosage were selected for parallel experiments, and the other components and dosages in the formulation were kept exactly the same. Through the following process flow, 7 kinds of black chemical oxidation solutions were compared and analyzed:

[0029] (1) Preprocessing:

[0030] Pickling and cleaning the surface of the steel sheet to remove rust and oil.

[0031] (2) Black chemical oxidation:

[0032] A) Preparation of oxidizing solution: Accurately weigh according to the amount of each component in the above table, put it in a beaker after weighing, add 200mL of water, stir and dissolve, heat the water bath to 50°C, measure the pH value of the solution (pH=2.5 ~4.6).

[0033] B) Oxidation and film formatio...

Embodiment 8-12

[0035] Examples 8-12: Experiments on black chemical oxidizing solutions containing different oxidants and no reducing agent and their blackening effects.

[0036]

[0037]

[0038] In order to determine the optimal composition of the oxidizing agent in the formulation, under the condition of not adding a reducing agent, five oxidizing agents with the same amount were selected for parallel experiments, and the other components and amounts in the formulation were kept exactly the same. By the technological process described in embodiment 1, measure the open circuit potential-time curve of the black oxide film that generates by 5 kinds of black chemical oxidation liquids in 3.5% (wt) NaCl solution, its result is as follows figure 2 shown.

[0039] Depend on figure 2 It can be seen that the highest open circuit potential is Cu(NO 3 ) 2 ·3H 2 O, its value is -0.4834V; the smallest open circuit potential is Fe(NO 3 ) 3 9H 2 O, its value is -0.5437V. Therefore, when t...

Embodiment 13-17

[0040] Examples 13-17: Experiments on black chemical oxidation solutions with different pH values ​​and their blackening effects.

[0041]

[0042] In order to investigate the influence of pH value on the performance of black oxide film, the pH value of the oxidation solution was adjusted (the range of pH value is 1-5), and the other components and dosages in the formula were kept completely consistent. By the technological process described in embodiment 1, measure the corrosion resistance of the black oxide film that is generated by 5 kinds of black chemical oxidation liquids, its result is as follows image 3 shown.

[0043] Depend on image 3 It can be seen that when the pH value rises from 3.01 to 5.00, the open circuit potential increases accordingly. When pH=5.00, the open circuit potential is the largest, which is -0.4944V, and when pH=3.01, the open circuit potential is the smallest, which is -0.6154V. However, when the pH value increased from 1.00 to 3.01, the ...

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Abstract

The invention relates to the technical field of metal material surface treatment, in particular to black chemical oxidation liquid for steel and application of the black chemical oxidation liquid. The black chemical oxidation liquid comprises a film-forming agent, an oxidizing agent, a reducing agent, a stabilizing agent, a pH buffering agent, a corrosion inhibitor, an assistant and water, wherein the black chemical oxidation liquid per liter contains 1-10g of the film-forming agent, 0.1-8g of the oxidizing agent, 1-20 g of the reducing agent, 1-10g of the stabilizing agent, 1-8g of the pH buffering agent, 1-8g of the corrosion inhibitor, 1-8g of the assistant and the balance water. According to the black chemical oxidation liquid, the oxidizing agent and the corrosion inhibitor are added based on the basic formula, and the corrosion resistance, adhesive force and the like of a black oxidized film are improved on the premise that energy saving, environmental friendliness, safety and high efficiency are guaranteed. The black chemical oxidation liquid is reasonable in formula, high in film-forming efficiency and easy and convenient to operate, and industrial application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, and relates to a black chemical oxidation solution for steel and its application in low-temperature black chemical oxidation treatment of steel parts. Background technique [0002] As a metal surface protection technology, steel black chemical oxidation process is widely used in production practice. At the same time, because of its advantages of high efficiency, energy saving, and good film-forming effect, it has become a research hotspot. At present, the most widely used high-temperature alkaline blackening process and normal temperature toxic blackening process have the disadvantages of serious environmental pollution and great harm to the human body. Therefore, researchers have developed a more energy-saving, environmentally friendly, safe and efficient black oxidation treatment method— —Non-toxic oxidation blackening process at room temperature. However, compared wi...

Claims

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Application Information

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IPC IPC(8): C23C22/17C23C22/10C23C22/36C23C22/12C23C22/13
CPCC23C22/17C23C22/10C23C22/12C23C22/13C23C22/36
Inventor 马迪李树白周熙雯于冬梅陈欣汤泽波赵颖超
Owner JIANGSU UNIV OF TECH
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