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Rust removing agent replacing hydrochloric acid to remove rust

一种除锈剂、盐酸的技术,应用在防锈,金属除锈领域,能够解决雇佣酸洗操作工人困难、不能满足除锈发展要求、酸洗车间环境恶劣等问题,达到克服除锈时间过长、加快除锈的速率、除锈性能优异的效果

Active Publication Date: 2019-03-22
ZHUJI HUARUI CHEM FIBER FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three environmental pollution problems in the hydrochloric acid pickling of steel parts: more acid mist, a large amount of acid rinse water and waste acid with a concentration of more than 7% are produced, which not only causes certain pollution to the environment, but also because of the harsh environment of the pickling workshop, In recent years, it has become extremely difficult to hire pickling operators. Therefore, in order to solve the problem of environmental pollution in hydrochloric acid derusting, many methods have been invented.
Chinese patent CN1039850 discloses a low acid concentration rust remover formula: acid concentration 8-12%, 15-200g / L iron (III) ions, in the practical application of this kind of rust remover because the formula is too simple, there is steel matrix Excessively corroded, requiring vigorous flushing to remove loose rust layers, thus generating large amounts of rinse water
[0006] To sum up, at present, for the pre-treatment rust removal of steel parts electroplating and hot-dip plating process, there is either acid mist or a large amount of rinsing water. The process of using hydrochloric acid for rust removal can no longer meet the existing development requirements for rust removal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An environmentally friendly process for replacing hydrochloric acid rust removal, wherein the rust remover used for rust removal is made of the following raw materials in parts by weight: 20 parts of composite organic acid, 5 parts of polymethacrylic acid, 6 parts of chromic anhydride, nonyl 5 parts of phenol polyoxyethylene ether, 5 parts of sodium dodecylbenzenesulfonate, 3 parts of sodium gluconate, 1 part of triethanolamine, 1 part of polyacrylamide, 1 part of 1,4-butynediol, sodium chloride 0.01 part, 0.2 part of defoamer, 0.3 part of solubilizer, and 70 parts of water; wherein, the composite organic acid is composed of naphthenic acid and tartaric acid in a weight ratio of 1:1.

Embodiment 2

[0022] An environmentally friendly process for replacing hydrochloric acid rust removal, wherein the rust remover used for rust removal is made of the following raw materials in parts by weight: 30 parts of composite organic acid, 10 parts of polymethacrylic acid, 12 parts of chromic anhydride, octyl 10 parts of phenol polyoxyethylene ether, 10 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 6 parts of sodium gluconate, 3 parts of triethanolamine, 3 parts of polyacrylamide, 2 parts of 1,4-butynediol, sodium chloride 0.1 part, 0.3 part of antifreeze, 0.3 part of defoamer, 90 parts of water; wherein, the composite organic acid is composed of naphthenic acid and tartaric acid in a weight ratio of 1:2.

Embodiment 3

[0024] An environmentally friendly process for replacing hydrochloric acid rust removal, wherein the rust remover used for rust removal is made of the following raw materials in parts by weight: 25 parts of composite organic acid, 8 parts of polymethacrylic acid, 9 parts of chromic anhydride, fatty alcohol 10 parts of polyoxyethylene ether, 5 parts of sodium dodecylbenzenesulfonate, 5 parts of sodium gluconate, 2 parts of triethanolamine, 2 parts of polyacrylamide, 1.5 parts of 1,4-butynediol, 0.06 parts of sodium chloride part, 0.4 part of solubilizer, 0.4 part of thickener, and 80 parts of water; wherein, the composite organic acid is composed of naphthenic acid and tartaric acid in a weight ratio of 1:1.5.

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PUM

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Abstract

The invention provides a rust removing agent replacing hydrochloric acid to remove rust. The rust removing agent for removing the rust is prepared from the raw materials in parts by weight: 20-30 parts of composite organic acid, 5-10 parts of polymethylacrylic acid, 6-12 parts of chromium trioxide, 10-20 parts of a surface active agent, 3-6 parts of sodium gluconate, 1-3 parts of triethanolamine,1-3 parts of polyacrylamide, 1-2 parts of 1,4-butynediol, 0.01-0.1 part of sodium chloride, 0.5-2 parts of a functional additive and 70-90 parts of water; the pH value of the rust removing agent is about 6.0, and the density is 0.9-1.2 g / cm<3>; according to the rust removing agent, the hydrochloric acid is not used, that is, generation of acid mist is reduced from the source, matter which harms human body is not used in the rust removing agent, the environment cannot be polluted, and the rust removing agent is an environment-friendly rust removing agent; and the rust removing agent has a superior rust removing property, the rust removing time is short, meanwhile, the rust removing efficiency is high, the gloss on the surface of metal substrate effectively recovers, and the rust removing agent has good application prospects.

Description

[0001] This application is a divisional application, the application number of the original application is 201610893288.9, the application date is October 13, 2016, and the title of the invention is "an environmental protection process for replacing hydrochloric acid rust removal". technical field [0002] The invention belongs to the technical field of metal rust removal and rust prevention, and in particular relates to a rust remover replacing hydrochloric acid rust remover. Background technique [0003] Rust removal treatment is the basic process before steel surface painting. Rust removal methods can be roughly divided into two categories: mechanical methods and chemical methods, each of which has its own characteristics and is suitable for different occasions. Among them, the chemical method has a series of advantages such as good effect, high efficiency, simple process operation, and low cost, so it has been widely used in industry. A common method in chemical rust re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
CPCC23G1/088
Inventor 王薇
Owner ZHUJI HUARUI CHEM FIBER FACTORY
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