Spectrophotometric study of corrosion inhibition of aluminium in orthophosphoric acid aqueous solutions by using sodium molybdate

ABSTRACT

The kinetics of the corrosion of aluminium in the orthophosphoric acid aqueous solution was investigated spectrophotometrically and gravimetrically. Sodium molybdate was applied as the inhibitor of the corrosion process. The analysis of the results obtained indicated that there are at least two species that might be useful for the inhibition of the corrosion. These are the products from the reduction of molybdophosphoric acid with aluminium. The mechanism of the inhibition of the corrosion depends on the initial concentration of sodium molybdate.

KEYWORDS:

• Aluminium
• sodium molybdate
• orthophosphoric acid
• corrosion inhibition

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Marek Wojnicki http://orcid.org/0000-0002-1387-0000

Przemysław Kwolek http://orcid.org/0000-0003-0376-5917

Additional information

Funding

The financial support from the National Science Centre, Poland (Narodowe Centrum Nauki) [grant no 2016/23/D/ST5/01343] is gratefully acknowledged.