Abstract
AbstractSurface conversion of steel by means of conducting iron phosphate coatings protects mechanical parts blanked from steel sheets, even in a very high‐humidity environment, and also allows their assembly through electrical resistance welding. Corrosion tests carried out by exposing the materials to alternate humid/dry cycles, in a humidostatic chamber at 40°C, indicate that the welding process gives rise to corrosion phenomena. These can be strongly mitigated by using conversion coatings of mixed iron/copper phosphates. Conditions for obtaining optimum corrosion resistance for the final conversion coatings are therefore defined.Measurements of the related corrosion potentials made at 25 °C in a sodium hydroxide solution (pH 12, saturated in oxygen) indicate the existence of threshold values above which corrosion resistance of the phosphatized specimens is acceptable, and suggest a method for performing an industrial control of phosphating efficiency.The performance of converted steel surface has been related to the porosity of phosphate coatings.
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