Chromium-free stainless steel passivating agent and passivation method using same

A technology of stainless steel and passivation agent, which is applied in the direction of metal material coating process, etc., can solve the problems of affecting human health, complex operation, high temperature requirements, etc., to improve salt spray resistance and high temperature oxidation resistance, passivation process simple effect

Active Publication Date: 2018-12-14
广东顺德中海源富环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chromate passivation agent contains hexavalent chromium or trivalent chromium, which are highly toxic substances and are carcinogenic, seriously affecting human health and causing environmental pollution.
The passivation method of the traditional stainless steel passivator is complicated to operate and requires high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: The components of the passivating agent are calculated in parts by weight: 8 parts of cerium nitrate, 5 parts of lanthanum nitrate, 3 parts of vinyl silane, 5 parts of methacryloxysilane, 3 parts of tannic acid, tartaric acid 3 parts, 3 parts of phytic acid, 3 parts of nano-titanium dioxide, 3 parts of organic acid, and the rest is deionized water.

[0047] The present embodiment utilizes the passivation method of this chromium-free stainless steel passivator to comprise the following steps:

[0048] A. Degreasing and activating the SUS304 stainless steel plate product, the degreasing agent can be calculated in parts by weight, consisting of 4 parts of sodium hydroxide, 3 parts of sodium metasilicate pentahydrate, 7 parts of soda ash, and 5 parts of isomeric alcohol polyoxyethylene ether Mix and stir with a certain amount of water, heat to 50°C, then soak the SUS304 stainless steel plate in the degreasing agent for 15 minutes, and then activate it with nitric...

Embodiment 2

[0054] Example 2: The components of the passivating agent include 12 parts by weight of cerium nitrate, 4 parts of aminosilane, 4 parts of methacryloxysilane, 5 parts of tannic acid, 1 part of citric acid, and 3 parts of tartaric acid , 4 parts of sodium nitrate, 2 parts of nano-titanium dioxide, 4 parts of organic acid, and the rest is deionized water.

[0055] The present embodiment utilizes the passivation method of this chromium-free stainless steel passivator to comprise the following steps:

[0056]A. Degreasing and activating the SUS201 stainless steel plate product. The degreasing agent can be calculated in parts by weight, consisting of 3 parts of sodium hydroxide, 1 part of sodium metasilicate pentahydrate, 5 parts of soda ash, and 3 parts of isomeric alcohol polyoxyethylene ether Mix and stir with a certain amount of water, heat to 40°C, then soak the SUS201 stainless steel plate in the degreasing agent for 10 minutes, and then activate it with nitric acid for 3 min...

Embodiment 3

[0062] Example 3: The components of the passivating agent include 8 parts by weight of cerium nitrate, 2 parts of cerium oxide, 2 parts of aminosilane, 6 parts of methacryloxysilane, 3 parts of tannic acid, 3 parts of citric acid 3 parts of phytic acid, 2 parts of nano-titanium dioxide, 5 parts of organic acid, and the rest is deionized water.

[0063] The present embodiment utilizes the passivation method of this chromium-free stainless steel passivator to comprise the following steps:

[0064] A. Degreasing and activating the SUS316 stainless steel plate product, the degreasing agent can be calculated in parts by weight, consisting of 5 parts of sodium hydroxide, 5 parts of sodium metasilicate pentahydrate, 10 parts of soda ash, and 8 parts of isomeric alcohol polyoxyethylene ether Mix and stir with a certain amount of water, heat to 60°C, then soak the SUS316 stainless steel plate in the degreasing agent for 20 minutes, and then activate it with nitric acid for 8 minutes to...

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PUM

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Abstract

The invention discloses a chromium-free stainless steel passivating agent. The chromium-free stainless steel passivating agent comprises the following components in parts by weight: 10-15 parts of rare earth metal salt, 3-5 parts of organic acid, 8-10 parts of a silane coupling agent, 3-5 parts of a complexing agent, 3-5 parts of a film curing agent, 3-5 parts of an accelerant, 2-3 parts of water-soluble titanium oxide and the balance of deionized water. After adoption of a formula, a preparation process of the chromium-free stainless steel passivating agent is environment-friendly and pollution-free, and the prepared passivating agent is a novel environment-friendly product that does not contain substances forbidden in European Union ROSE instructions.

Description

technical field [0001] The invention relates to the field of chromium-free stainless steel passivator, in particular to a chromium-free stainless steel passivator and a passivation method using the chromium-free stainless steel passivator. Background technique [0002] Although stainless steel has good corrosion resistance and high temperature oxidation resistance, it brings surface dirt, rust and oxide film welding slag during processing, which affects the corrosion resistance of stainless steel equipment and components. [0003] Chromate passivation technology has been used as the main passivation technology for steel and alloys for a long period of time due to its excellent self-repairing effect of passivation film, wide range of applications, and cost advantages. However, the chromate passivating agent contains hexavalent chromium or trivalent chromium, which are highly toxic substances and carcinogenic, seriously affecting human health and causing environmental pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50C23C22/78
CPCC23C22/50C23C22/78
Inventor 莫佳杰谭海广谭富陈念龙谭海桥
Owner 广东顺德中海源富环保科技有限公司
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