The use of electrochemical measurement techniques towards quality control and optimisation of corrosion properties of thermal spray coatings
article
Metal spray coatings are ever more recognised as a possible superior means of corrosion protection in many environments. Extended service life combined with little or no maintenance provides interesting opportunities for both environmentalists and corrosion engineers. Although many successful applications of corrosion protection using thermal spray coatings have been reported, both in atmosphere as in immersion service, new applications remain limited. The complexity of the coating buildup and the number of parameters that may greatly affect the resulting corrosion protection continues to confuse possible users. An important instrument to support the selection of thermal spray coatings is the development and implementation of a reliable quality control procedure. Particularly, concerning the corrosion protection behaviour, the use of both traditional and modem electrochemical tools can provide important information in this respect. Moreover, the mechanistic information resulting from electrochemical tests can not only be used for quality testing purposes but may also be used to optimise the application parameters of the thermal spray coating to achieve the best possible corrosion protection in a specific environment. This paper describes the use of various electrochemical measurement methods to determine the electrochemical characteristics of stainless steel AISI 316, aluminium and Monel 400 thermal spray coatings in aqueous environments. An evaluation will be made of the applicability of the technique and the interpretation of the obtained results towards thermal spray application parameters.
TNO Identifier
234812
ISSN
02555476
Source
Materials Science Forum, 289-292, pp. 595-606.
Collation
13 p.
Pages
595-606
Files
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