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Which chemical is used in the method of parkerizing, adopted to prevent corrosion?

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in Construction & Building Materials by (190k points)
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

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Right choice is (c) Pareo

To explain I would say: In the method of parkerizing, adopted to prevent corrosion, the article to be treated for corrosion is immersed in a hot water bath of a chemical called Pareo. Insoluble phosphates are created on the surface of the article which keeps away the moisture.

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