Which chemical is used in the method of parkerizing, adopted to prevent corrosion?
(a) Alum
(b) Borax
(c) Pareo
(d) Vitriol
This question was addressed to me in an interview for job.
The above asked question is from Ferrous Metals topic in section Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials