A Zr-doped single-phase Pt-modified aluminide coating and the enhanced hot corrosion resistance

•Single-phase Zr-doped β-(Ni,Pt)Al coating is prepared by Pt-Zr electroplating and aluminisation.•With Pt/Zr modification, hot corrosion resistance of plain NiAl coating is notably improved.•After 200 h, Cr-rich belt is observed in accordance with Cl in deeper (Ni,Pt)Al coating.•Zr fixes and stabilises S at surface, capable of inhibiting presence of S at OZ/IDZ interface.•Internal chlorination, which occurs in normal (Ni,Pt)Al, is absent in Zr-doped (Ni,Pt)Al coating.