What kind of peak we get for nickel coating on mild steel in FTIR spectra,?

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Jürgen Weippert

Maybe figure 5 here is what you are looking for:

Article Optical and Structural Characterization of Nickel Coatings f...

As most metals do, Nickel reflects most of the IR radiation. If you suspect residues of NiSO4, here's a spectrum:

https://spectrabase.com/spectrum/41WROEkGFSP

Zia Ullah Khan

May be the attached article will help you in this regard