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Preparation of power tool parts before electroplating
- 2019-04-08-

Applying a controlled current to a component in an alkaline cleaning solution is called "electric cleaning". This is done by connecting the components to the electrical leads in the rectifier and immersing them in an alkaline cleaning solution, thereby producing an electrochemical effect. This method is widely used to prepare electroplated parts.

Pre-processing racks and batch-processed parts. It can remove dirt on any object-from pushpins to coiled 48-inch steel coils. Today's technology enables us to adopt self-regulation, precise voltage and current, and alkaline solutions. Electrical energy can be applied as direct current (DC), reverse current (RC), periodic reverse (PR) or interrupt (IR).

Alloy gearWhy is it clean?

The usual reason for cleaning is to prepare parts for subsequent finishing-electroplating, electroless plating, painting, electrocoating, anodizing, electrolytic polishing, conversion coating and sealing as examples.

The cleaning of mixer level 5 accessories should strengthen the surface of the parts to be cleaned. However, if used improperly, it may damage the surface. You can remove dirt and oxidize or make the surface partially or completely inert during this process. In this sense, you have stained the surface with new pollutants! But with proper application, cleaning can improve the acceptability of subsequent coatings.

The third reason for cleaning small household electrical appliances is to remove stains, oxide films, etc. Sometimes, this process simply enhances the beauty appeal. Cleaning can also facilitate handling, quality inspection, visual acceptance, correct fixtures, etc.

Degreasing is another main reason for using any cleaning operation. However, in order to properly perform any further surface treatment, the membrane needs to be removed by degreasing. At the same time, you should realize that although degreasing is a good process, although you can perform proper surface treatment in an alkaline cleaning station, another step may be required to complete the pretreatment of the plating. The limitation of using chlorinated solvents for degreasing increases the value and potential of electrical cleaning.

Base metals that can be cleaned

If we have some general rules of thumb regarding what can and cannot be cleaned with various types of alkaline cleaners, it will make life easier.

Any alkaline cleaner. Standard alkaline cleaners can be used on steel, stainless steel, tool steel, alloy steel, copper, nickel, nickel alloys, titanium, zirconium, and lead / tin without causing a "cure to be worse than disease" situation.

Suppress alkaline cleaners. These solutions contain chemicals that prevent unnecessary reactions with metals or alloys in the presence of caustic- (OH) radicals. This chemical is necessary to clean brass, bronze, zinc and its alloys, aluminum and its alloys, tin-metal itself or plating.

acid. There are many acid cleaners that can clean metals such as magnesium well. The cleaning process must be customized to deal with the type of soil expected on a given part. Table I lists many soils that the trimmer must remove. This is by no means a complete list. But the supplier of cleaning chemicals must know the soil you want to remove.

Soil is usually classified as organic or inorganic. Organic soils include oil and wax, as well as redeposited soils. Inorganic soils can range from heat treatment scale, oxide film and pickling pollutants to polishing compounds and abrasives to workshop dust.

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What is a cleaner?

Alkaline cleaners usually contain carbonates, borax, sodium metasilicate, phosphates, synthetic detergents and surfactants. As shown in Table III, these chemicals have specific functions. Carbonate is added for pH control and buffering. Sodium metasilicate, as a dispersant. Phosphate, used for water softening and isolation. Borax, used for buffering and dispersion. Synthetic detergent ("mini soil magnet") for wetting, emulsifying, complexing, chelating and acting as a biocide. Surfactants carry a positive charge (cation), a negative charge (anion) and no charge (non-ion).