Abstract
Polymeric coatings have been used extensively to prevent corrosion of steels. This study investigates the use of a polymeric coating for prevention of corrosion-fatigue of steels used in the production of paper. The fatigue limit of specimens from three steels, with and without a polymer coating, was determined in white water environment (containing NaCl, HCl, Na2S2O3, NaSO4 and H2O) at 50°C and 20 cycles/s The polymer coating used is a polyurethane which was applied on the gage length portion of the specimens. This was selected from a number of possible candidates. This coating thickness did not exceed 0.1 mm. It was found that in most cases the presence of coating extends the numbers of cycles to failure. The ability of the polymer to deform, thus ensuring that adhesion under load takes place, and also its resistance to white water are used to explain the substantial increase in corrosion-fatigue resistance. Scanning electron microscopy of the fractured surface cross-sections confirms these observations.
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