Finish Corrosion Resistance Coating Thickness Abrasion Resistance

Powder Coating

· Corrosion resistance depends on type of material used and pre-treatment process

· Surface must be pre-treated before powder coat or part will be at risk of corrosion and adhesion issues

· Chips or incomplete coverage adds to risk of corrosion

· Can range from 70 to 150μm

· Thicker than traditional liquid paint

· Improves appearance

· Various colors and textures available

· Heat cured finish

· Material composition and pre-treatment may have enhanced abrasion resistance

· Creates a hard finish that resists abrasion well

E-Coating

· Good corrosion resistance

· Provides physical and chemical barrier to corrosion

· Typically 12 to 30μm but can be more

· Often used to increase surface thickness

· Thickness of application is uniform

· Good durability

· Heat cured finish

· Good longevity

Zinc Plating

· Provides physical barrier to corrosion

· Acts as a sacrificial anode to prevent corrosion

· Parts can sustain minor damage and remain corrosion resistant

· Can range from 5 to 25μm

· If use as an undercoat for other finishes, poor adhesion

· Best for detailed surfaces and not heavy-duty applications

· Very strong finish

· Highly durable to abrasion

Geomet

· Provides barrier resistance to corrosion

· Creates passivation effect on surface

· Between 5 to 7.6μm

· Can be used under a painted finish

· Mid abrasion resistance

· Electrically conductive finish

· Good resistance to chemicals, organics, heat, salt

Anodizing

· Good corrosion resistance

· Commonly used for saltwater or marine environments

· Ranges from 0.5 to 150μm

· Hard, wear resistant finish

· Often used for parts that come in frequent contact with other material

Passivation

· Good corrosion resistance through an inert, oxide layer

· The process removes free iron from the surface leaving a thin and transparent oxide film

· Does not change durability or abrasion resistance

Galvanized Dipped

· Provides barrier resistance to corrosion

· Acts as a sacrificial anode to prevent corrosion

· At more than 254μm the finish is prone to flaking

· Poor appearance

· Can adjust thickness of finish to accommodate needs

· Often used in harsh environments because of durability

· Good abrasion resistance

· Good durability and longevity

· Surface damage can result in corrosion

Finish Sheet Metal CNC Turning Application Visual Requirements Thickness Corrosion resistance
Carbon Steel Stainless Steel Aluminium Carbon Steel Stainless Steel Aluminium
Mill Finish             Internal Parts or Parts with Subsequent Processing Low-Visual - -
Antirust Oiling             Parts with Subsequent Processing Low-Visual - 24 Hours NSS
Brushed             Indoor Med-Visual - -
Anodized             Indoor / Outdoor High-Visual - -
Micro-Polishing             Indoor / Outdoor High-Visual - -
Passivation             Indoor / Outdoor Med-Visual 0.5 to 15μm -
Zinc Plating             Indoor / Outdoor Low-Visual 5 to 25μm 48 to 96 Hours NSS
E-Coating             Indoor / Outdoor Low-Visual 5 to 25μm 96 Hours NSS
Powder Coating             Indoor / Outdoor High-Visual 70 to 150μm 480-1000 Hours

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