Types of Anti-corrosion Coatings

Anti-corrosion coatings provide a robust level of protection against corrosion for components operating in highly corrosive environments. The three types of anti-corrosion coatings explained: The options for anti-corrosion coatings are vast but they can be broken down into three main groups; barrier, inhibitive and sacrificial. In this blog post we outline the differences between the three types of anti-corrosion coatings.

Barrier coatings

Barrier coatings form a protective non-porous layer over a substrate that prevents the surrounding environment from affecting the base metal. If a barrier coating is applied to the base metal without any other coating or film and is damaged by impact or chemical attack, the substrate is then unprotected. Film thickness and solid content significantly affect the lifespan of the protection.

Inhibitive coatings

Inhibitive porous coatings form a passive layer on a substrate that reacts with metal and humidity as it penetrates the film. The corrosion protection offered by inhibitive coatings significantly reduces over time and is why these coatings are regularly used in primers that are overcoated.

Sacrificial coatings

Sacrificial coatings act as an additive over a substrate which sacrificially corrodes to protect the material below. Unlike barrier coatings, sacrificial coatings remain effective if the film is damaged, however the level of protection offered is dependent on the additive content level and type of paint binder used.

Important anti-corrosion coating considerations

When looking to choose a suitable partner for your anti-corrosion coating requirements it is important to check for several factors:

– Are barrier, inhibitive and sacrificial coatings all available?

– Will the scope include coating inspectors?

– Is there suitable technical support to understand your challenge and recommend the best type of anti-corrosion coating?

– Does the potential supplier and/or service provider have the flexible capacity to cope with the volumes and processes to meet deadlines?

– Are there sufficient facilities to cope with the size and geometry of the components?

Information provided by Surface Technology.


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