Normal-temperature corrosion-resistant phosphating solution and preparation method thereof

Abstract

The invention discloses a normal-temperature corrosion-resistant phosphating solution and a preparation method thereof. The normal-temperature corrosion-resistant phosphating solution is prepared from the following raw materials in parts by weight: 35-56 parts of deionized water, 6-8 parts of sodium molybdate dehydrate, 2-7 parts of chromic acid, 5-8 parts of hydroxylamine sulphate, 4-8 parts of methyl methacrylate, 4-5 parts of sodium fluoroborate, 4-9 parts of tartaric acid, 22-24 parts of citric acid, 2-6 parts of cyclohexanehexol hexaphosphate ester, 1-8 parts of ammonium cuprate, 2-6 parts of m-nitrobenzene, 3-6 parts of sodium silicate and 6-10 parts of manganese dihydrogen phosphate. Compared with a conventional phosphating solution and a conventional phosphating process, the normal-temperature corrosion-resistant phosphating solution disclosed by the invention has the advantages that when a workpiece is subjected to phosphating by adopting the normal-temperature corrosion-resistant phosphating solution, the phosphating process is simplified, the phosphating efficiency is improved, and the phosphating cost is reduced; meanwhile, a phosphating film formed by adopting the normal-temperature corrosion-resistant phosphating solution not only is denser and more uniform, but also can be used for effectively protecting the workpiece from corrosion; and the preparation method is simple and low in cost.

Description

Technical field [0001] The invention relates to a normal temperature corrosion-resistant phosphating solution and a preparation method thereof. Background technique [0002] In order to improve the anti-rust ability of the surface of steel parts, the surface is usually phosphated. Phosphate film is mainly used as the bottom layer of paint coating, the lubricating layer of metal cold processing, and the metal surface protection layer, etc., which can play a variety of functions such as anti-rust, anti-wear and wear resistance, lubrication, and enhance the adhesion of the coating to the metal substrate. The phosphating process of steel parts is mostly medium-high temperature phosphating, which requires degreasing and rust pretreatment before treatment, and the temperature is high, the energy consumption is high, the phosphating time is long, and the process is complicated. Phosphating is a process of forming a phosphate chemical conversion film by chemical and electrochemical reac...

AI Technical Summary

Problems solved by technology

Although scientists have done a lot of research in this area, it is not yet fully understood

After the end of World War II, there were few breakthroughs in phosphating technology, but steady development and improvement.

However, the phosphating agents on the market now have a thin phosphating film of 2-4 μm after the workpiece is phosphating, which has poor corrosion resistance and is easy to hang dust, which cannot meet the corrosion resistance requirements of the workpiece.