Aluminium–Thiourea Mixtures as Corrosion Inhibitors for Mild Steel in Water

Abstract

New aluminium–thiourea inhibitors for mild steel in water are reported. These inhibitors, a combination of aluminium sulphate, thiourea and cationics, are tested using the weight loss method according to NACE Standard TM-01–69. It was found that the corrosion rate of mild steel in distilled water can be decreased markedly (up to 79·0%) if aluminium ions are used in conjunction with thiourea and cationics. The concentration of the aluminium ions in the mixture and the nature of the anion which accompanies these ions are critical for the inhibitive efficiency of the combination tested; thiourea and cationics appear to augment this efficiency if their dosage (and their composition–where cationics are concerned) are chosen properly.

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References

Kato

, Koiwai

, & Kuwano

, Corros. Sci., 1979, 19, 937

loychev, M. & Bankovska, I., Proc. 8th Int. Congr. metallic Corros., Mainz, 1981, p. 1488

Iovchev

, Patent Pending No. 51876, 1981. P. R. Bulgaria

Ailor

W. H.

, ‘Handbook on Corrosion Testing and Evaluation’, 1971, P. 115 (New York: John Wiley & Sons, Inc.)

Standard

ASTM

G16-71, ‘Standard recommended practice for applying statistics to analyses of corrosion data’

Iovchev

& Bankovska, I., Proc. 5th Nat. Conf., ‘Heat and Nuclear Engineering Problems of P. R. Bulgaria’, 1981, p. 236