Analysis of surface treatment process of stainless steel castings: polishing, sandblasting and electroplating technical guide
Stainless steel castings are widely used in medical, food, chemical and other industries, and their surface treatment processes directly affect the corrosion resistance, aesthetics and service life of the products. This article will introduce in detail three common surface treatment processes of stainless steel castings - polishing, sandblasting and electroplating, to help users choose the appropriate processing method according to their needs.
1. Mechanical polishing: improve surface finish
Mechanical polishing uses abrasive materials (such as grinding wheels, polishing paste) to rub the surface of stainless steel to remove burrs and oxide layers to make the surface smooth.
Process features:
Applicable scenarios: Suitable for parts that require high surface finish, such as medical equipment and food equipment.
Technical points: It is necessary to control the polishing pressure and rotation speed to avoid dimensional deviation caused by excessive polishing.
FAQ: Uneven polishing may cause scratches, requiring multiple adjustments to process parameters.
Industry application: Conveyor belt rollers for food processing equipment, surgical instrument handles, etc.
2. Sandblasting: Enhance surface adhesion
Sandblasting uses high-speed sand particles (such as alumina, glass beads) to impact the stainless steel surface to form a uniform rough texture.
Process features:
Applicable scenarios: Suitable for workpieces that require spraying and pre-plating treatment to improve coating bonding strength.
Technical points:Sand particle size (80-120 mesh) affects surface roughness and needs to be selected according to subsequent processes.
FAQ: Excessive sandblasting may cause thinning of the substrate, so the sandblasting time and air pressure need to be controlled.
Industry application: Inner walls of chemical reactors, building decoration parts, etc.
3. Electroplating process: improve corrosion resistance and decoration
Electroplating is the deposition of a layer of metal (such as chromium, nickel) on the surface of stainless steel to enhance corrosion resistance or improve appearance.
Process features:
Applicable scenarios: Parts that require acid and alkali resistance or high decorative requirements, such as bathroom hardware and auto parts.
Technical points: The surface needs to be cleaned before electroplating to avoid impurities affecting the bonding strength of the coating.
FAQ: Blistering or peeling of the coating may be caused by insufficient pre-treatment.
Industry application:Faucets, electronic equipment casings, etc.
How to choose the appropriate surface treatment process?
functional requirements: For corrosion resistance, electroplating is preferred, for wear resistance, sandblasting is preferred, and for high finish, polishing is preferred.
cost considerations: Polishing cost is low, and electroplating fluctuates greatly due to metal prices.
Environmental requirements: Sandblasting requires dust collection equipment, and electroplating involves wastewater treatment.
The surface treatment of stainless steel castings directly affects product performance and life. Polishing, sandblasting, and electroplating each have their own advantages. Enterprises should choose the appropriate process according to actual needs and strictly control the processing parameters to ensure stable quality. If you need to know more about the specific process details, you can consult a professional casting processing service provider.