Stainless Steel Corrosion Types

Lean duplex standard duplex and super duplex.

Stainless steel corrosion types.

Corrosion is a major problem especially in the construction industry where various metals are used for structural purposes. The most common types are. The most common forms of corrosion in stainless steel are. Corrosion resistance of stainless steels contents 1.

Pitting corrosion the passive layer on stainless steel can be attacked by certain chemical species. For example grade 304 stainless steel when used in naval applications may start to suffer pitting as a result of contact with seawater which is rich in salt or salt enriched sea breezes. Most materials decayover time 2. Duplex grades are usually divided into three sub groups based on their corrosion resistance.

The chloride ion cl is the most common of these and is found in everyday materials such as salt and bleach. Their mixed microstructure provides improved resistance to chloride stress corrosion cracking in comparison to austenitic stainless steel types 304 and 316. Under localized corrosion we have three types. How to select the right stainless steel for adequate corrosion.

Types of stainless corrosion according to the dod technical bulletin corrosion detection and prevention there are 8 separate types of corrosion with only a few having a major impact on stainless steel. Types of corrosion of stainless steels 4. In aqueous environments metals may be exposed to not only uniform corrosion but also to various types of local corrosion including pitting crevice intergranular stress and galvanic corrosion. Corrosion is the process of deterioration of metal caused by the action of chemicals or electro chemicals present in the surrounding atmosphere.

Different types of corrosion are explained in this article. Pitting corrosion is one of the most difficult types of corrosion to spot. Many types of stainless steel alloys will suffer extreme pitting corrosion when exposed to environments that are rich in chlorides such as salt. Chloride ion is the most common of these and is found in everyday materials such as salt and bleach.

In such aggressive environments stainless steel piping buried in soils should therefore be coated. In principle stainless steels should be in the passive state in soils but the presence of water and aggressive chemical species such as chloride ions sulphates and as well as types of bacteria and stray current can cause localised corrosion. It happens when a cavity is formed in the metal. Pitting corrosion on stainless steel the passive layer on stainless steel can be attacked by certain chemical species.

These types of corrosion target a specific area in a metal s structure. Please be advised the descriptions below are extremely brief and written in laymen terms.