Protective coats on Aluminium surface

 Different Types of Protective Coats on Aluminium

 

Why protective layer or coating is used on Aluminium Surface: -

For High wear and tear resistance

For Corrosion resistance

To Protect from atmospheric degradation and making it durable

 

Following methods of coating are used: -

Powder Coating –

It's a dry finishing process that combines fine particles of resin and color pigment and spray with electrostatic charge method.

Advantage of Powder Coat-

Provide smooth surface

Available in different and long-lasting colors

High Durable

High UV resistance

Less hard and less durable compared to anodizing

Good appearance

Good corrosion Resistance

Anodic Coating or Anodizing: -

Anodic coat does not apply on external surface like paint. It's an electrochemical process used to increase the thickness of natural oxide layer on aluminium surface. During anodizing process pores are created on the surface, so desired pigments are introduced that fill the pores.

Advantage –

improve corrosion resistance and wear resistance

Decorative

Cleaned with water or Detergents

Nonhazardous

Available in different colors

Increase lifespan and Durability

UV stable

Not peel or flake

Disadvantage –

Expensive

Only used on specific grade of aluminium

Not suitable in Acidic Environment

Limited range of color compared to spray paints

PVDF (Polyvinylidene fluoride) Coating: - 

Coatings made from polyvinylidene fluoride resin nCH2CF2 baking (CH2CF2) n(PVDF) as the base material or with metal aluminium powder as the color material.

Advantage –

highly corrosion resistant

High mechanical strength

Toughness

Durability

Rigidity

Light Weight with low and high temperature resistance

Resistant to fading and weathering

Suitable for wall cladding, Curtain wall, Roofing Sheet

Thiner layer compared to powder coating

 

Some other coatings on Aluminium :-

Bright Dipping: -

To create shiny or mirror like finish on Aluminium.

Sublimation: -

Creating colored patterns on aluminium surface is known Sublimation.

Mostly used to create wood pattern on aluminium surface.