Stainless steel passivation solution and method for improving corrosion resistance of stainless steel wiredrawing floor drain

Abstract

The invention discloses a stainless steel passivation solution and a method for improving the corrosion resistance of a stainless steel wiredrawing floor drain. The stainless steel passivation solution is prepared from the components including, by mass, 30.0%-40.0% of citric acid, 2.0%-4.3% of 1-hydroxyethylidene-1,1-diphosphonic acid, 3.0%-8.0% of polymaleic acid, 4.0%-7.0% of sodium sorbate, 5.0%-12.0% of 1-benzyl pyridinium-3-carboxylate and the balance water. According to the method for improving the corrosion resistance of the stainless steel wiredrawing floor drain, the stainless steel wiredrawing floor drain is passivated by the aid of the stainless steel passivation solution. The passivation solution is good in passivation effect, only citric acid is contained in inorganic acid, nitric acid and sulfuric acid are not contained, and the passivation solution is more environmentally friendly and healthier for bathroom products and does not harm operators on a passivation site.

Description

technical field [0001] The invention relates to the field of corrosion resistance, in particular to a method for improving the corrosion resistance of a stainless steel wire drawing floor drain. Background technique [0002] The brushed stainless steel floor drain is a product that is frequently used in the bathroom among sanitary products. On July 21, 2020, GB / T 27710-2020 "Floor Drain" was released, in which the salt spray test of the stainless steel wire drawing floor drain was changed from the acetic salt spray test to the neutral salt spray test, and the cleaning agent resistance test was added. In the actual test, the neutral salt spray test of the stainless steel wire drawing floor drain failed to pass the 96h level 9 required by the national standard, and the test result of the resistance to cleaning agents was unqualified. [0003] In order to overcome the above problems, it is necessary to improve the corrosion resistance of stainless steel products, and stainless...

AI Technical Summary

Problems solved by technology

Chromic acid contains hexavalent chromium, which is highly corrosive, and hexavalent chromium is a carcinogen, which is destructive to the human body and the environment

Secondly, for different types of materials, different passivation solutions need to be used according to the properties of the materials; even for the same type of materials, such as stainless steel, the stretching process will cause some changes in its internal structure, and the destructive effect of the wire drawing process on the surface If it is larger, it will affect the corrosion resistance. To achieve better corrosion resistance, passivation is generally adopted, but the use of general passivation solution cannot meet the corrosion resistance requirements of stainless steel wire drawing floor drains. Passivation is required. Optimal corrosion resistance can only be achieved by optimizing the liquid and / or combining post-treatment processes

Therefore, the general passivation solution is not suitable, and further optimization of the passivation solution components and passivation process and / or post-treatment procedures is required to meet the demand

Images