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Neutral environment-friendly stainless steel passivator and preparation method thereof

A stainless steel, environmentally friendly technology, applied in the direction of metal material coating process, etc., can solve the problem of heavy pollution of acid system passivators, and achieve the effect of strong density, improved corrosion resistance, and thick film thickness.

Active Publication Date: 2021-02-09
惠州市佳一美金属表面处理材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problem of the heavy pollution of existing acidic system passivator, provide a kind of neutral environment-friendly stainless steel passivator and preparation thereof method

Method used

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  • Neutral environment-friendly stainless steel passivator and preparation method thereof
  • Neutral environment-friendly stainless steel passivator and preparation method thereof
  • Neutral environment-friendly stainless steel passivator and preparation method thereof

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preparation example Construction

[0059] Further, the present invention also provides the preparation method of the neutral environment-friendly stainless steel passivator of above-mentioned preferred formula, comprises the following steps:

[0060] First, add an appropriate amount of deionized water into the container, and then add the required amount of sodium phytate and complexing agent into the deionized water, and stir to fully dissolve;

[0061] Then, add the required amount of molybdate into the container and stir to make it fully dissolved, then add the rare earth metal salt and stir to make it fully dissolved; slowly add the oxidant while stirring, add all the remaining deionized water into the container and stir Uniform;

[0062] Finally, add a pH regulator into the container to adjust the pH value of the mixed solution to 7-8, and after standing for one hour, a neutral environment-friendly stainless steel passivator is obtained.

[0063] Further, the present invention also provides the passivation...

Embodiment 1

[0066] The neutral environment-friendly stainless steel passivator described in the present embodiment comprises the following components by weight percentage:

[0067] 1% sodium phytate, 0.3% complexing agent, 0.5% molybdate, 0.03% rare earth metal salt, 0.02% oxidizing agent, 0.2% pH regulator and 97.95% deionized water.

[0068] Wherein, the complexing agent is sodium gluconate; the molybdate is sodium molybdate, and the rare earth metal salt includes cerium sulfate and lanthanum sulfate; the oxidizing agent is sodium ferrate; the pH regulator is carbonic acid sodium. The pH value of the neutral environment-friendly stainless steel passivator is 7.

[0069] The preparation method of neutral environment-friendly type stainless steel passivator described in present embodiment one, comprises the following steps:

[0070] First, add an appropriate amount of deionized water into the container, and then add the required amount of sodium phytate and complexing agent into the dei...

Embodiment 2

[0074] The neutral environment-friendly stainless steel passivator described in the second embodiment comprises the following components by weight percentage:

[0075] 3% sodium phytate, 1% complexing agent, 2% molybdate, 0.8% rare earth metal salt, 0.4% oxidizing agent, 0.8% pH regulator and 92% deionized water.

[0076] Wherein, the complexing agent is a mixture of sodium citrate and EDTA disodium salt; the molybdate is a mixture of potassium molybdate and modified aluminum molybdate; the rare earth metal salt is lanthanum sulfate; the oxidizing agent is A mixture of sodium ferrate and potassium permanganate; the pH regulator is citric acid. The pH value of the neutral environment-friendly stainless steel passivator is 7.

[0077] The preparation method of the neutral environment-friendly stainless steel passivator of the present embodiment 2 is the same as that of the embodiment 1, and is prepared with reference to the embodiment 1.

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Abstract

The invention discloses a neutral environment-friendly stainless steel passivator which comprises sodium phytate, a complexing agent, molybdate, rare earth metal salt, an oxidizing agent, a PH regulator and deionized water. The passivator disclosed by the invention does not contain toxic heavy metal elements such as chromate, does not contain nitrate, phosphate and other water pollutants, does notcontain corrosive acid and is neutral, so that complex wastewater treatment process requirements are not needed. The reaction process of the passivator for generating a passivation film is stable, the passivation film is thicker and higher in density compared with inorganic acid film layers, the stability of the film layers is higher, and the corrosion resistance and the salt spray resistance arehigher.

Description

technical field [0001] The invention belongs to the technical field of metal passivation, and in particular relates to a neutral environment-friendly stainless steel passivator and a preparation method thereof. Background technique [0002] Stainless steel has the characteristics of good corrosion resistance, high temperature resistance, low temperature resistance, wear resistance and beautiful appearance. It is widely used and has been widely used in aerospace, atomic energy, ocean development, petrochemical, automobile, architectural decoration, household appliances, kitchen utensils and other industries. Wide range of applications. [0003] Due to the surface defects and hidden dangers of corrosion caused by stainless steel during processing, black scale and other metal compounds, yellow welds and grease during cold drawing will appear. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be passivated to form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/68
CPCC23C22/68
Inventor 周喜珍
Owner 惠州市佳一美金属表面处理材料有限公司
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