Environmental protection stainless steel workpiece passivation process

Abstract

The invention discloses an environment-friendly stainless steel workpiece passivation technique. The environment-friendly stainless steel workpiece passivation technique comprises the steps that a workpiece is soaked in a room temperature alkalescence oil and grease removing agent for ultrasonic rinsing; then the workpiece is taken out and is rinsed with deionized water and dried for use; then thesurface of the workpiece is sequentially polished with a coarse abrasive paper and a fine abrasive paper; then the workpiece is soaked into a room temperature faintly acid rust remover for ultrasonicrinsing; then the workpiece is soaked into an alkalescence liquid for neutralizing the faintly acid rust remover remaining on the surface of the workpiece; then the workpiece is taken out and is rinsed with deionized water and dried for use; environment-friendly passivation liquid is prepared; the passivation liquid is heated to 45-55 DEG C and the workpiece is soaked in the passivation liquid for 20-30 min; then the workpiece is rinsed with water to remove the passivation liquid remaining on the surface of the workpiece; and finally the workpiece is dried. By adopting the technique providedby the invention, a passivation film with a compact structure and a smooth surface is obtained; corrosion to stainless steel is effectively inhibited and alleviated; the self-corrosive current of thepassivation liquid is obviously lowered; the anti-rusting and anti-corrosion ability of the stainless steel is greatly improved, so that the service life of the stainless steel is prolonged; and the passivation liquid does not pollute the environment.

Description

Technical field[0001]The invention relates to an environmental protection process for passivating stainless steel workpieces.Background technique[0002]Stainless steel has superior corrosion resistance, wear resistance, toughness, high temperature oxidation resistance, and excellent mechanical and processing properties, so it is widely used in chemicals, machinery, construction, petroleum, power, nuclear engineering, aerospace, marine, medicine , Light industry, textile and other fields.[0003]Most of the stainless steel equipment or parts will cause surface oil stains, rust, non-metallic dirt, low melting point metal contaminants, paint during the process of forming, assembling, welding, welding seam inspection (such as flaw detection, pressure test) and construction marking. , Welding slag and spatter, etc. These substances seriously affect the quality of the oxide film on the surface of stainless steel equipment and components. The corrosion resistance of stainless steel mainly dep...

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Problems solved by technology

[0004] At present, most stainless steel industries at home and abroad still use the traditional chemical passivation process. The passivation solution contains heavy pollutants such as dichromate ions, nitric acid, hydrochloric acid, sulfuric acid, and hydrofluoric acid, which seriously endanger the environment and the health of operators. Meet the technical requirements of green cleaning such as non-toxic and harmless

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