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.

磷酸盐化学转化（PCC）涂层被广泛用于提高钢的耐腐蚀性。然而，很少研究不同基材热处理对PCC涂层的制备和性能的影响。这项研究集中于35CrMnSi钢的轧制（R），正火（N），淬火（Q），低温回火（LT）和回火（T）处理对这些钢上后续PCC涂层的影响。结果表明，热处理对涂层形成速率，磷酸盐晶体尺寸和涂层防腐性能起着至关重要的作用。热处理的基材的涂层形成速率如下：Q＞ T＞ LT＞ N＞ R。基材的耐蚀性顺序为：R＞ N＞ LT＞ T＞ Q。经过不同热处理的PCC涂层钢的耐腐蚀性能如下：T> LT> Q。PCC涂层的回火样品由于涂层的均质和微晶结构而具有最佳的耐腐蚀性。