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Types of Surface Treatment and External Appearance Colors

Types of Surface Treatment
External Appearance Colors of Surface Treatment

Types of Surface Treatment

*The figures below are reference values.

Name		Vickers hardness （HV）	Layer thickness （μm）	Treatable materials	Examples of Use	Purpose/features	Remarks
Zinc plating		−	3～20	Steel	Thin plates Wires	- Rust preventing, low cost - External appearance not good	−
Chromate plating		−	1～2	Steel	Sheet metal parts Bolts and nuts	- Rust preventing, low cost - Suited to mass production - Works as an nickel plating alternative although the appearance is not as good	−
Bright chromate plating		−	1～2	Steel	−		−
Trivalent chromate		−	1～2	Steel	Bolts and nuts	- Rust preventing, low cost - Does not contain hexavalent chrome	−
Nickel plating		−	−	Steel Copper Brass	−	- Improves corrosion resistance and gives decorative quality - Chrome plating has better corrosion resistance in the open air	- Apply base coating to copper as necessary - Cannot applied to deep recesses
	Buffed plating	500	5～20			- Better external appearance than plating without buffing	- Material -> Buffing -> Plating -> Buffing
	Plating without buffing	500	5～20			−	- Material -> Plating
	Satin plating	−	−			- Fatigue resistant - Small scratches are not noticeable	- Material -> Matte finish -> Plating
Electroless nickel plating		500	Can be specified	Steel Stainless steel Copper Aluminum alloy Glass Plastic	Parts that cannot be nickel-plated Parts to be hardened after plating	- Film thickness control is easy - Excellent corrosion resistant and abrasion resistance - Can make non-metallic materials conductive - Can be hardened with heat treatment after plating	−
Chrome plating		−	−	Steel Copper Brass	−	- Glossy external appearance - Excellent corrosion resistance - Sliding contact between chrome plating can cause seizure	- Needs base coat with nickel as necessary - Cannot applied to deep recesses
	Buffed plating	500	5～20			- Better external appearance than plating without buffing	- Material -> Buffing -> Plating -> Buffing
	Plating without buffing	500	5～20			−	- Material -> Plating
	Satin plating	−	−			- Fatigue resistant - Small scratches are not noticeable	- Material -> Matte finish -> Plating
	Rigid chrome plating	1000	10～30		Shafts Sliding parts	- Outstanding abrasion resistance - More expensive than other chrome plating	- Material -> Plating (without buffing)
Black oxide coating (black oxide finish)		−	−	Steel	Bolts Nuts Measuring instruments	- Base painting - External appearance (glossy) - More prone to rust than TUFFTRIDE process	- Generates black oxide steel
Low temperature black chrome plating		−	1～2	Steel Copper Stainless steel	Parts that require precision	- Long-term rust prevention - The most excellent corrosion resistance among black plating - Ultra thin film	- Gives no heat impact on the material thanks to the low temperature treatment and parts coupled with plastic, rubber, and other materials can be processed as they are.
Anodizing	White	−	3～5	Aluminum alloy	−	- Corrosion-proof and abrasion resistant - No electrical conductivity - Heat resistant	- A color anodizing coating is performed by generating a hard oxide film on the surface and using pores on the film to color the material.
Anodizing	Black	−	5～10	Aluminum alloy	−