Preparation method of descaling working fluid for stainless steel weld joint

Abstract

The invention relates to the technical field of chemical descaling, and especially relates to a preparation method of descaling working fluid suitable for stainless steel weld joints. The preparation method of descaling working fluid for stainless steel weld joints comprises the following steps: at normal temperature, adding water with a weight percent of 71.5%-85.5% into a stirrer; orderly adding 9%-13% of fatty alcohol polyoxyethylene ether, 0.3%-0.7% of alkyl phenol polyoxyethylene ether, 1%-5% of citric acid, 2%-6% of tartaric acid, 0.3%-0.7% of anhydrous sodium carbonate, 0.8%-1.2% of triethanolamine, 0.8%-1.2% of hydrochloric acid, and 0.3%-0.7% of sodium molybdate under stirring; after all the materials are added, stirring for 20-30 min. The invention is simple in operation, and good in descaling effect; no corrosion to the stainless steel surface is caused, and the glossiness of the stainless steel is maintained; in addition, the descaling working fluid for stainless steel weld joints can be used repeatedly, has no harm during skin contact, is low-carbon, environment-friendly, and cost-saving.

Description

technical field [0001] The invention relates to the technical field of chemical descaling, in particular to a preparation method of a descaling liquid suitable for stainless steel metal welds. Background technique [0002] According to the national automobile industry, large automobiles, buses, trucks, cars, etc. all use 316L stainless steel for fuel tanks, water tanks, and exhaust pipes, but the black sintered parts of the stainless steel welds are difficult to remove. In order to remove these sinters, the traditional method is to use nitric acid or hydrofluoric acid for treatment. Although it can play a role in descaling, strong acids are strongly corrosive to the surface of stainless steel and make the thickness of stainless steel thinner. In addition, because nitric acid or hydrofluoric acid is harmful to the human body, care must be taken during descaling, which may pose a potential safety hazard. In particular, the sour smell of harmful toxins in nitric acid or hydrof...

AI Technical Summary

Problems solved by technology

[0002] According to the national automobile industry, large automobiles, buses, trucks, cars, etc. all use 316L stainless steel for fuel tanks, water tanks, and exhaust pipes, but the black sintered parts of stainless steel welding are difficult to remove

In order to remove these sinters, the traditional method is to use nitric acid or hydrofluoric acid for treatment. Although it can play a role in descaling, strong acid is strongly corrosive to the surface of stainless steel and makes the thickness of stainless steel thinner.

In addition, because nitric acid or hydrofluoric acid is harmful to the human body, you must be careful when descaling, and there are hidden dangers of unsafety.

In particular, the sour smell of harmful toxins in nitric acid or hydrofluoric acid not only has a strong sense of stimulation to the human body, but also produces acid mist that seriously pollutes the air, and the discharge of waste acid water also seriously pollutes water resources.

At the same time, care must be taken when preparing the above-mentioned descaling solution, which is very troublesome to prepare