Pickling passivation method of stainless steel

Abstract

A pickling passivation method of stainless steel is characterized in that the method comprises the following steps of: (1) oil removing; (2) first rinsing; (3) pickling passivation, wherein a specially-prepared pickling passivating solution is proportioned by 20% of nitric acid, 10% of hydrofluoric acid, and 70% of purified water, and the workpiece is soaked in groove liquid completely; (4) second rinsing; (5) meutralization by alkali liquor, wherein the workpiece is soaked in an alkaline groove liquid completely; (6) first water washing; (7) third rinsing; (8) air drying; (9) stoving; (10) confining liquid spraying; (11) natural air drying; (12) packaging with air-cushion films. The invention combines two original steps of pickling and passivation into one step, which effectively increases the corrosion resistance of the stainless steel, improves the hand fingerprint contamination resistance of the stainless steel, ensures the surface decoration performance of the stainless steel products, and the method has the characteristics of simple process, low production cost, less environment pollution, easy operation, low labor intensity, low energy consumption, and high efficiency.

Description

technical field

[0001] The present invention relates to a surface treatment method for stainless steel plates, in particular to a stainless steel pickling passivation method that can effectively improve the corrosion resistance of stainless steel, improve the anti-fingerprint pollution performance of stainless steel, and ensure the surface decoration of stainless steel products. The invention belongs to the technical field of surface treatment of stainless steel plates. Background technique

[0002] After stainless steel products are processed, most products need to be pickled and passivated to ensure the corrosion resistance of stainless steel products. Most of the current pickling and passivation processes are divided into two steps: pickling and passivation. The ratio of pickling solution used is: 20% nitric acid + 5% hydrofluoric acid + 75% water, Proportion: 5% nitric acid + 2% potassium dichromate + 93% pure water, and the surface of stainless steel products after pic...