Abstract
Phosphate chemical conversion (PCC) coatings are widely used to improve the corrosion resistance of steels. However, the effects of different substrate heat treatments on the preparation and properties of PCC coatings have rarely been investigated. This research focuses on the influence of rolled (R), normalizing (N), quenching (Q), low-temperature tempering (L-T) and tempering (T) treatments of 35CrMnSi steels on subsequent PCC coating onto these steels. The results showed that the heat treatments played a vital role in coating formation rate, phosphate crystal size and coating anti-corrosion properties. The coating formation rate for heat-treated substrates was as follows: Q>T>L-T>N>R. The order of corrosion resistance of substrates was: R>N>L-T>T>Q. The anti-corrosion resistance of PCC-coated steels after different heat treatments was as follows: T>L-T>Q. The PCC-coated tempered sample offered the best corrosion resistance due to the homogeneous and fine-crystal microstructure of the coating.
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