A study of the corrosion of carbon steel by alkaline chloride solutions containing, either or both hydrogen peroxide and sodium thiosulphate (EN)

Kouloumbi, N (EN)

Kotsakou, K (EN)

Batis, G (EN)

The aim of this experimental work was to compare the relative effects on the corrosion of carbon steel of Na2S2O3.5H(2)O, Na2S2O5, H2O2 and NaCl in caustic solutions. Bore steel specimens and specimens coated with two different cootings were examined in these solutions. The corrosivity was evaluated by carrying out corrosion potential, potentiodynamic polarization and mass loss measurements. The results indicate that Na2S2O3.5H(2)O ond Na2S2O5 have no significant effect on the corrosion rate of bore steel, but which increases fourfold when these sulphur compounds ore both present in the caustic solutions. H2O2 is a corrosion activator only in solutions of sulphur salts or in solutions which contain chloride ions. Thiosulphate ions, In the presence of chlorides, impair steel passivation especially at high concentrations of chloride. This combination is the most harmful. The coating systems provided protection in all cases. Both had a two component epoxy system finishing coat and a different primer. One, comprising a water-based primer with dispersed tonnin, gave higher protection than the other in which the primer was a two-compound acrylic system containing a chromate pigment. (EN)

journalArticle (EN)

Engineering, Chemical (EN)

Materials Science, Coatings & Films (EN)

Chemistry, Applied (EN)

THIOSULFATE (EN)

National Technical University of Athens

Digital Library of National Technical University of Athens | Dspace@NTUA

Κεντρική Βιβλιοθήκη Ε.Μ.Π.

Ιδρυματικό Αποθετήριο

Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά

Surface Coatings International Part B: Coatings International (EN)

English

1996 (EN)

http://hdl.handle.net/123456789/11752

1 (EN)

79 (EN)

26 (EN)

1356-0751 (EN)

ISI:A1996TW50300002 (EN)

21 (EN)

OIL COLOUR CHEM ASSN (EN)