Chemical stainless steel polishing solution

Abstract

The invention discloses a chemical stainless steel polishing solution which comprises the following components in content: 80mL/L to 120mL/L of 68% nitric acid, 50mL/L to 150mL/L of 40% hydrofluoric acid, 50mL/L to 120mL/L of 30% hydrogen peroxide, 50mL/L to 80mL/L of 85% phosphoric acid, 50mL/L to 80mL/L of 98% concentrated sulfuric acid, 10mL/L to 30mL/L of 95% ethanol, 5g/L to 15g/L of urea, 20g/L to 40g/L of a brightening agent, 0.5g/L to 2g/L of a fog inhibitor and 2g/L to 6g/L of a corrosion inhibitor. The chemical polishing solution is stable in polishing speed; a processed stainless steel workpiece is flat in surface, bright, free of dust, also stable in performance, capable of being stored for a long time and low in production cost; during polishing, irritant acidic gas is small in volatility.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a stainless steel chemical polishing liquid. Background technique [0002] After the stainless steel is exposed to the air for a long time or used for a certain period of time, dust or grease will easily adhere to the surface of the stainless steel and undergo chemical changes, forming a thin and dense oxide film, the main component of which is chromium oxide Cr 2 o 3 , nickel oxide NiO and insoluble iron chromium oxide FeO Cr 2 o 3 , this layer of oxide film not only affects the appearance of the product, but also affects the subsequent processing. There are mechanical, chemical and electrochemical methods to remove the oxide scale. The traditional pickling process is generally used in China, and pickling agents are commonly used. Divided into two categories: one is sulfuric acid-chromic acid series, this kind of solution is stable and has a certain polishing effect, bu...

AI Technical Summary

Problems solved by technology

[0002] After the stainless steel is exposed to the air for a long time or used for a certain period of time, dust or grease will easily adhere to the surface of the stainless steel and undergo chemical changes, forming a thin and dense layer Oxide film, its main components are chromium oxide Cr2O3, nickel oxide NiO and insoluble iron chromium oxide FeO·Cr2 O3, this layer of oxide film not only affects the appearance of the product, but also affects the subsequent processing. There are mechanical methods, chemical methods and electrochemical methods to remove the oxide scale. Traditional methods are generally used in China. pickling process, commonly used pickling agents are divided into two categories: one is sulfuric acid-chromic acid series, this type of solution is stable, and has a certain polishing effect, but the chromium contained in the pickling agent seriously pollutes the environment, wastewater treatment The cost is high, one is the sulfuric acid-nitric acid series. This kind of pickling agent has a high use temperature, and the removal effect on thick scale is not ideal at room temperature. The pickling time is long, which leads to high processing costs, especially the black slag on the weld. Basically, it cannot be removed, and volatile nitrogen oxides will be produced during the polishing process, polluting the environment