Products & Services

Surface Treatment

Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property.[1] Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws, and control the surface friction.[1][2] In limited cases some of these techniques can be used to restore original dimensions to salvage or repair an item.

Surface finishing processes can be categorized by how they affect the workpiece:

  • Removing or reshaping finishing
  • Adding or altering finishing
  • A proper surface treatment for formed workpiece can improve surface looking, protection and physical characteristic like higher harness, anti-corrosion or smooth surface.
  • The surface treatment can be sorted with six categories:
    1. Mechanic treatment: Bead Blasting, Cutting, Polishing, Grinding
    2. Metallurgic treatment: Heat treatment (Annealing, Tempering, Quenching)
    3. Chemical treatment: Electrolyzed Polishing, Acid Pickling
    4. Surface Coating: Electro Plating, Sputter, Evapora
    5. Inorganic Coating: Hard Anodizing, Oxide, Conversion Coating
    6. Organic Coating

Electro Plating

Electroplating is the deposition of a metallic coating onto an object by generating a negative charge onto the object and immersing it into a solution, which contains salt of the metal to be deposited. The metallic ions of the salt carry a positive charge and are attracted to the part. When they reach the negatively charged part it provides the electrons to reduce the positively charged ions to metallic form.

Anodizing

It is an electrochemical process that thickens and toughens the naturally occurring protective oxide. The resulting finish, depending on the process, is the second hardest substance known to man, second only to the diamond. The anodic coating is part of the metal, but has a porous structure which allows secondary infusions, (i.e. organic and inorganic coloring, lubricity aids, etc.).

Powder Coating

Powder coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin". The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional paint. Powder coating is mainly used for coating of metals, such as "whiteware," aluminium extrusions, and automobile and bicycle parts. Newer technologies allow other materials, such as MDF (medium-density fibreboard), to be powder coated using different methods.

Passivation

Passivation is "the removal of free iron particles or iron compounds from the stainless steel surface by means of a chemical dissolution, most typically by a treatment with an acid solution that will remove the surface contamination."

In lay terms, the passivation process removes "free iron" contamination left behind on the surface of the stainless steel from machining and fabricating. These contaminants are potential corrosion sites that result in premature corrosion and ultimately result in deterioration of the component if not removed. In addition, the passivation process facilitates the formation of a thin, transparent oxide film that protects the stainless steel from selective oxidation (corrosion).