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Normal-temperature blackening liquid for steel and iron and application thereof

A normal temperature, steel technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance, poor bonding force, poor gloss and other problems of film formation, achieve excellent film performance, solve poor stability, and reduce dosage.

Inactive Publication Date: 2017-06-09
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the low stability, difficult storage, high toxicity, poor film-forming corrosion resistance, poor gloss and poor bonding force of the existing iron and steel blackening liquid at room temperature, the purpose of the present invention is to provide a more excellent and environmentally friendly Normal temperature blackening solution for steel, in order to improve the gloss, corrosion resistance and bonding force of the blackening film, so that it can be vigorously promoted in the industry

Method used

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  • Normal-temperature blackening liquid for steel and iron and application thereof
  • Normal-temperature blackening liquid for steel and iron and application thereof
  • Normal-temperature blackening liquid for steel and iron and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0024] Examples 1-3: Blackening solutions containing different contents of nickel sulfate and experiments on their blackening effects.

[0025]

[0026] In order to determine the optimal content of nickel sulfate in the formula, three blackening solutions with different nickel sulfate contents were selected for parallel experiments, and the other components and dosages in the formula were kept exactly the same. Through the following process flow, the three kinds of blackening solutions are compared and analyzed:

[0027] (1) Preprocessing:

[0028] Washing, pickling (removing oil and rust) and cleaning the surface of steel parts.

[0029] (2) Blackening treatment:

[0030] Immerse the pretreated specimens in the three blackening solutions made of the components in the above table respectively, control the blackening time to 16min, and the blackening temperature to 50°C.

[0031] (3) Post-processing:

[0032] Seal and passivate the blackened specimen.

[0033] Measure t...

Embodiment 4-8

[0034] Examples 4-8: Experiments on blackening solutions containing different contents of citric acid and their blackening effects.

[0035]

[0036] In order to determine the optimal content of citric acid in the formula, five blackening solutions with different citric acid content were selected for parallel experiments, and the other components and dosages in the formula were kept exactly the same. Through the following process, the five blackening solutions were compared and analyzed:

[0037] (1) Preprocessing:

[0038] Washing, pickling (removing oil and rust) and cleaning the surface of steel parts.

[0039] (2) Blackening treatment:

[0040] Immerse the pretreated specimens in the three blackening solutions made of the components in the above table respectively, control the blackening time to 16min, and the blackening temperature to 50°C.

[0041] (3) Post-processing:

[0042] Seal and passivate the blackened specimen.

[0043] Measure the AC impedance curve in ...

Embodiment 9-12

[0044]Examples 9-12: Experiments on blackening solutions containing different contents of OP-10 and their blackening effects.

[0045]

[0046] In order to determine the optimal content of OP-10 in the formula, four blackening solutions with different OP-10 contents were selected for parallel experiments, and the other components and dosages in the formula were kept exactly the same. Through the following process flow, 4 kinds of blackening solutions are compared and analyzed:

[0047] (1) Preprocessing:

[0048] Washing, pickling (removing oil and rust) and cleaning the surface of steel parts.

[0049] (2) Blackening treatment:

[0050] Immerse the pretreated specimens in the three blackening solutions made of the components in the above table respectively, control the blackening time to 16min, and the blackening temperature to 50°C.

[0051] (3) Post-processing:

[0052] Seal and passivate the blackened specimen.

[0053] Measure the Tafel curve of the blackened film...

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Abstract

The invention relates to the technical field of surface treatment of metal materials, in particular to normal-temperature blackening liquid for steel and iron and application thereof. Specifically, the normal-temperature blackening liquid for steel and iron comprises selenous acid, copper sulfate, nickel sulfate, zinc dihydrogen phosphate, phosphoric acid, citric acid, octylphenol polyoxyethylene ether-10 and water; and each 1 L of the normal-temperature blackening liquid contains 1-6 g of selenous acid, 1-10 g of copper sulfate, 1-2 g of nickel sulfate, 1-5 g of zinc dihydrogen phosphate, 1-10 mL of phosphoric acid, 1-5 g of citric acid, 1-4 mL of octylphenol polyoxyethylene ether-10 and the balance of water. The normal-temperature blackening liquid is reasonable in formula and high in film forming efficiency, improves such performances as glossiness, binding force and compactness of blackening films, and solves the problem of weak stability; the application method is convenient and feasible, and is suitable for large-scale popularization; and through adding of additives, the use level of selenium element in the blackening liquid is reduced, and the pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal materials, and relates to a normal-temperature blackening solution for steel and its application in normal-temperature blackening treatment of steel pieces. Background technique [0002] The steel blackening process is mainly used to improve the corrosion resistance of steel and play a certain decorative role. At present, there are mainly two methods: high-temperature alkaline blackening and room temperature blackening. The blackening time of high-temperature alkaline blackening (alkaline bluening) is long, the energy consumption is high, and nitrite is used, and the waste liquid produced is serious to environmental pollution. Blackening at room temperature (acid chemical oxidation) only takes a few minutes to ten minutes, the operating temperature is around 10-60°C, and the size of the steel part hardly changes during the operation. Compared with high-temperature alkaline blac...

Claims

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Application Information

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IPC IPC(8): C23C22/17C23C22/18C23C22/42
CPCC23C22/17C23C22/186C23C22/42
Inventor 马迪李树白周熙雯于冬梅冯尚欢郭赵涛
Owner JIANGSU UNIV OF TECH
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