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Introduction to Corrosion and Erosion Management

Corrosion is often defined as the degradation of a material (metals corrode) due to interaction of its surface with the local contacting environment.  We are usually concerned with metal corrosion in aqueous (presence of moisture) environments which involves electrochemical metal dissolution reactions.

There are many forms of corrosion.  Corrosion is exacerbated when a corrosive fluid (electrolyte) is present (aqueous corrosion) and therefore the damage caused by mechanical effects are usually increased by the presence of the corrosive medium (fatigue corrosion, fretting corrosion and erosion corrosion, etc.).

In most situations the cost of special corrosion resistant alloys is an important project consideration and where possible the use of carbon steel is the preferred option as it is the most economical.

The types of corrosion that are most commonly encountered are:

  • General / Uniform corrosion
  • Pitting corrosion
  • Microbial corrosion
  • Erosion-corrosion and
  • Fatigue corrosion
  • Galvanic corrosion
  • Crevice corrosion
  • Intergranular corrosion
  • Selective leaching (de-alloying)
  • Environmental assisted cracking (SCC (stress corrosion cracking), H2 embrittlement, LME (liquid metal embrittlement)
  • Cavitation & Turbulence (flow & velocity induced corrosion)

The above list is not exhaustive, but indicates those types of corrosion that may be encountered on a frequent basis.

There are other types such as:

  • Concentration cell corrosion (O2, Solution concentration differences)
  • Fretting corrosion
  • Stray current corrosion
  • High temperature (oxidation) corrosion

The above types of corrosion need to be managed and detected in order to manage assets across industry sectors. With this in mind Argyll-Ruane Ltd (ARL) are developing a course, including examination to ensure operative competency in conjunction with BINDT requirements to train NDT operatives to detect and accurately report different corrosion and erosion types.

ARL are the official training provider for the Institute of Corrosion (ICorr) and courses are delivered from our Rotherham facility.  A full list of relevant courses can be found here.  For more information on all of our courses, call us on 01709 560459 or email

Author: Stephen Wisniewski
            Courses and Examinations Manager
            BEng (Hons), CEng, MWeldI, ASNT L3, PCN L3, CSWIP L3

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