Corrosion

Pitting corrosion is a non-reversible process i.e. once corrosion has begun you can only deal with the consequences.

Pitting corrosion generally occurs in aggressive environments, and where the protective passive film is damaged.

There are many different approaches to the measurement of corrosion, and specifically pitting corrosion.

The best defence against crevice corrosion is to limit the potential for crevices.

The main difference between pitting and crevice corrosion is the geometry of the corrosion site.

The most common form of crevices are very small gaps and contact points around fasteners, joints and washers.

NACE MR1075 specifies the types of corrosion resistant materials that can be used in specific oilfield environments.

Corrosion is a form of chemical reaction which will form a visible corrosion product.

Localised corrosion occurs in specific locations rather than across the entire exposed surface.

General (or uniform) corrosion is the most common form of corrosion, where corrosion occurs across most of the surface area of the metal.

There are many different variants of corrosion, reflecting both the impact of different environments and the failure mechanism.

Nickel alloys will corrode in the same way as stainless steels if exposed to suitably corrosive environments.