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Corrosion Resistant Coatings

corrosion resistant coatings

Corrosion resistant coatings can be divided into two main categories.

1) Sacrificial, where the corrosion resistant coating preferentially corrodes, even if scratched or damaged, protecting the substrate.

2) Barrier, where the corrosion resistant coating protects the substrate by blocking the access from a corrosive medium.

To understand the principles of corrosion resistance more fully, we recommend you read our tutorial on corrosion resistant coatings.

Poeton offer a wide range of corrosion resistant coating. (Please follow the links to the product pages for detailed data on applications and non-stick capability.)

Hard Chrome. Hard Chrome plate (Apticote 100) is an excellent corrosion resistant coating. However, it is micro-cracked, and must be undercoated with either electrolytic nickel or a thin, dense variety of hard chrome, which is softer and crack free (Apticote 100C).

Hard Anodising Composite Coatings. Applicable only to aluminium alloys, hard anodising composites produce a hard oxide wear resistant coating infused or topped with a durable polymer (Apticote 350), transformed from the parent metal rather than deposited as a separate coating. The combination provides an excellent barrier corrosion resistant coating, protecting the underlying substrate. (See also Apticote 355, a specialist anodic composite that provides up to 15,000 hrs salt spray corrosion resistance.)

A more energetic form of hard anodising, termed Plasma Electric Oxidation, creates oxides with much high hardness, and can provide a thick, corrosion resistant coating on aluminium, and an effective barrier corrosion resistant coating on magnesium.

Sulphuric Acid Anodising, Chromic Acid Anodising and Tartaric Sulphuric Acid Anodising all provide excellent corrosion resistant coatings on aluminium alloys, typically for use in Aerospace and Defence industries.

Electroless Nickel. This is an effective corrosion resistant coating, particularly if combined with a friction polymer sealant as in Apticote 460.

Cadmium Plating is probably the ultimate sacrificial corrosion resistant coating, effectively protecting high strength steel fasteners and other critical components on aircraft.

Silver Plating is an effective corrosion resistant coating, being resistant to many organic acids, as well as sodium and potassium hydroxide. When sulphur is a hazard, special anti-tarnishing treatments can be applied to greatly increase the protection.

corrosion resistant coatings

Such corrosion resistant coatings are applicable across a wide range of industrial sectors. Please follow the Markets menu tag on our Home Page to find your specific industry.