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Shot blasting is a cold treatment process, divided into shot blast cleaning and shot peening. Castings of different shapes are placed in the shot blasting machine, through the cast steel shot, cast iron sand, stainless steel shot and other materials to hit the surface of the casting, can remove impurities on the surface of the casting, so that it gets a uniform and consistent surface organization. Carbon steel, low and medium alloy steel, tool steel and other materials are easy to rust after treatment, the follow-up also need to be other surface treatment.
Scope of application: materials other than non-ferrous alloys.
Pre-treatment: The workpiece should be surface cleaned before sandblasting. Commonly used methods are: electric sanding, solvent cleaning, acid washing, etc.
Masking of areas not to be blasted: A self-adhesive film of rubber or PVC is used as a masking material, usually between 1.0 and 0.3 mm thick.
Start of blasting: the abrasive is shot out of the machine and hits the surface to achieve the desired objective
Recycling of the sand (abrasive): first the fan sucks the sand (abrasive), the dust and the airflow into the filter. In the filtering of the dust-laden air, the dust is attached to the outer wall of the filter, while the clean air is discharged outside the plant and partially back into the blasting room. The sand (abrasive) etc. will be divided into sorters, changing the airflow channel cross section and adjusting the separation ratio. The main separation process is as follows: when the sand (abrasive) and dust pass through the channel together, the dust and gas come out upwards through the gap between the cones as the sand is heavier. The abrasive then falls into the vibrating screen below. The vibrating screen then separates the coarser particles from the abrasive. The clean sand (abrasive) thus separated by the cycle passes through the designated screen holes into the blast tank. The dust and gas are then separated by passing through the filter as above.
Range of application: All materials.
Passivation is the process by which a metal is oxidised by strong oxidising agents or electrochemical methods so that the surface becomes inactive, i.e. passivated, which is a method of transforming the metal surface into a state that is less susceptible to oxidation and slows down the corrosion of the metal. The surface of the castings after treatment is bright, shiny and beautiful.
Scope of application: stainless steel, copper alloy.
With the metal workpiece as the anode, electrolysis in a suitable electrolytic solution, selectively remove its rough surface, improve the degree of surface finish technology, also known as electrolytic polishing. Electropolishing can increase the corrosion resistance of stainless steel, reduce the resistance of electrical contact points, prepare metallographic abrasives, improve the reflective properties of lighting fixtures, improve the accuracy of various gauges, beautify metal household goods and handicrafts, etc.
Scope of application: stainless steel.
Grinding is the finishing process (e.g. cutting) of a machined surface by the relative movement of the grinding tool and the workpiece under certain pressure, using abrasive particles coated or embedded in the grinding tool.
Scope of application: stainless steel.
Mechanical polishing relies on the grinding and tumbling action of very fine polishing powders to remove a very thin layer of metal from the grinding surface of the specimen. Mechanical polishing is divided into two kinds of matte polishing and mirror polishing. The surface of the castings after matte polishing is smooth, with lines, like a layer of matte; mirror polishing of the casting surface like mirror-like bright, the surface roughness can be ≤ Ra0.2.
Scope of application: stainless steel.
Electroplating is a process that uses electrolytic techniques to coat the surface of a metal with a layer of another metal or aluminum alloy. It is the process of attaching a metal film to the surface of a part made of metal or other material using electrolysis and includes the process of oxidizing the metal in the air, such as immersion, abrasion resistance, electrical conductivity, reflective surfaces, corrosion resistance, sodium thiosulphate immersion, etc. We currently have the ability to electroplate blue and white zinc, color zinc, nickel, chromium, and KTL coatings. The surface is smooth and lustrous after electroplating, silvery white after white zinc plating, iridescent after colored zinc plating, white and lustrous after nickel and chromium plating, and black after KTL plating.
Range of application: carbon steel, low and medium alloy steel, and tool steel.
Spraying is applied to the surface of the object to be coated by means of a spray gun or disc atomiser, dispersed into uniform and fine droplets by means of pressure or centrifugal force. It can be divided into air spraying, airless spraying, electrostatic spraying, etc.
Scope of application: carbon steel, low to medium alloy steel, tool steel.
Castings are placed in a phosphating solution, deposited on the surface to form a crystalline phosphate conversion film insoluble in water. The purpose of phosphating is mainly to provide protection to the base metal, to a certain extent, to prevent the metal from being corroded; for priming before painting, to improve the adhesion of the paint film layer and anti-corrosion ability; in the metal cold working process to reduce friction lubrication use.
Scope of application: carbon steel, low to medium alloy steel, tool steel.
Blackening, also known as boiling black or bluing, is a method of surface treatment for steel. The coating is produced by the reaction between the chemical solution and the material of the workpiece itself.
Scope of application: carbon steel, low to medium alloy steel, tool steel.
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