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Normal/low-temperature chemical conversion solution for 35CrMnSi steel and preparing method thereof

A chemical conversion, normal and low temperature technology, applied in the direction of metal material coating process, etc., can solve the problems of unsuitable carbon content, difficult medical stainless steel, easy to produce precipitation, etc., to improve surface protection performance, easy to operate, and simple to use Effect

Active Publication Date: 2016-01-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent has the following disadvantages: the conversion film needs to be formed under medium and high temperature conditions, and the phosphating solution is unstable and prone to precipitation. The patent is to form a layer of zinc phosphide conversion film on the stainless steel substrate. The film has a hierarchical structure. The purpose is to facilitate biological applications, and the corrosion resistance is poor. This patent is aimed at the problem that medical stainless steel with a passivation film is difficult to phosphate, and is not suitable for alloys with high carbon content.

Method used

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  • Normal/low-temperature chemical conversion solution for 35CrMnSi steel and preparing method thereof
  • Normal/low-temperature chemical conversion solution for 35CrMnSi steel and preparing method thereof
  • Normal/low-temperature chemical conversion solution for 35CrMnSi steel and preparing method thereof

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Effect test

Embodiment 1

[0026] A normal-low temperature chemical conversion solution for 35CrMnSi steel, which comprises the following ingredients in parts by weight: 30 parts of nitric acid, 10 parts of phosphoric acid, 25 parts of zinc oxide, 5 parts of reduced iron powder, 7 parts of composite accelerator, and add water to 1000 parts. The composite accelerator consists of citric acid and sodium chlorate.

[0027] The preparation method of the above-mentioned chemical conversion solution is as follows: first, zinc oxide, nitric acid, and phosphoric acid are added to the beaker in turn, and magnetically stirred until completely dissolved; secondly, the composite accelerator is added, stirred until completely dissolved, and water is added to 1000 parts; finally, iron powder is added to into the solution, take out the iron powder after aging for 14 hours, and adjust the pH value to 2.75.

[0028] Depend on figure 1 It can be seen that the phase composition of the film layer is zinc phosphate (Zn 3 (...

Embodiment 2

[0030] A normal-low temperature chemical conversion solution for 35CrMnSi steel, which comprises the following ingredients in parts by weight: 25 parts of nitric acid, 5 parts of phosphoric acid, 20 parts of zinc oxide, 3 parts of reduced iron powder, 10 parts of composite accelerator, and add water to 1000 parts. The composite accelerator is mainly composed of citric acid and sodium chlorate.

[0031] The preparation method of the above-mentioned chemical conversion solution is as follows: first, zinc oxide, nitric acid, and phosphoric acid are added to the beaker in turn, and magnetically stirred until completely dissolved; secondly, the composite accelerator is added, stirred until completely dissolved, and water is added to 1000 parts; finally, iron powder is added to into the solution, take out the iron powder after aging for 10 hours, and adjust the pH value to 2.5.

Embodiment 3

[0033]A normal-low temperature chemical conversion solution for 35CrMnSi steel, which comprises the following ingredients in parts by weight: 15 parts of nitric acid, 15 parts of phosphoric acid, 20 parts of zinc oxide, 3 parts of reduced iron powder, 7 parts of composite accelerator, and add water to 1000 parts. The composite accelerator is mainly composed of citric acid and sodium chlorate.

[0034] The preparation method of the above-mentioned chemical conversion solution is as follows: first, zinc oxide, nitric acid, and phosphoric acid are added to the beaker in turn, and magnetically stirred until completely dissolved; secondly, the composite accelerator is added, stirred until completely dissolved, and water is added to 1000 parts; finally, iron powder is added to into the solution, after aging for 6 hours, take out the iron powder, and adjust the pH value to 2.0.

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Abstract

The invention discloses a normal / low-temperature chemical conversion solution for 35CrMnSi steel and a preparing method thereof. The conversion solution consists of the following components in percents by weight: 10-30% of nitric acid, 5-15% of phosphoric acid, 15-25% of zinc oxide, 1-5% of iron powder, 5-10% of a compound accelerant and the balance of water, wherein the compound accelerant is prepared from citric acid and chlorate. The preparing method comprises the following steps: (1), dissolving the zinc oxide in the nitric acid and the phosphoric acid; (2), then, adding the compound accelerant, and after fully dissolving, adding the water; and (3), adding the iron powder into a solution obtained in step (2), taking out the iron powder after curing, and regulating the pH value to 2.0 to 3.0. The normal / low-temperature chemical conversion solution for 35CrMnSi steel does not contain toxic components, the use method is simple and is easy to operate, energy consumption and production cost are low, one layer of even and dense conversion film consisting of 2-5mum flaky zinc phosphate crystals can be formed on the surface of a base body, and the corrosion resistance is great.

Description

technical field [0001] The invention belongs to the technical field of metal surface modification, and relates to a normal-low temperature chemical conversion liquid for 35CrMnSi steel and a preparation method thereof. Background technique [0002] With the development and progress of science and technology, metal processing parts are becoming increasingly high-parameter, lightweight and large-scale development, and higher and higher requirements are put forward for the performance of steel. Due to its excellent performance and remarkable economic benefits, 35CrMnSi alloy steel has become an important metal material widely used in national economic construction and national defense construction, and its output accounts for about 10% of the total steel output. However, the defects of low corrosion resistance and oxidation resistance of alloy steel limit its application. Chemical conversion treatment has been used in the industrial field for hundreds of years. One of the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/13
Inventor 吕宇鹏姜葱葱肖桂勇朱瑞富
Owner SHANDONG UNIV
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