The electrochemical behaviour, in neutral solutions, of selective solar absorber coatings prepared from ferritic stainless steel using an original conversion treatment is studied by a polarisation technique. After preparation, these coatings present good resistance to corrosion in a humid environment. After thermal treatment in air at high temperatures, a corrosion peak may appear on the polarisation curve; this phenomenon cannot occur for flat collectors where the working temperature is lower than 250°C. The corrosion peak which appears after heating at high temperatures is observed only during the phase of structural reorganisation of the coating; it disappears after longer treatment times.
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References
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