Atmospheric corrosion initiation on steel from predeposited NaCl salt particles in high humidity atmospheres

Abstract

Corrosion initiation on steel from predeposited NaCl particles was observed in situ using an optical microscope. Corrosion did not initiate from small droplets (D<&sim45 μm) formed by the deliquescence of predeposited NaCl particles upon exposing to high humidity (RH>80%). Corrosion occurred under larger NaCl droplets and was accompanied by the formation of secondary droplets outside of the perimeter of the initial droplets. Sometimes, corrosion that initiated from the large NaCl droplets propagated in the form of filiform corrosion. Elemental mapping using energy dispersive X-ray analysis showed that Cl was concentrated at the filament tip, while Na migrated to the outside region of the secondary droplets. Under large NaCl droplets, there was evidence that corrosion initiated from slag based inclusions.

Keywords

ATMOSPHERIC CORROSION CORROSION INITIATION NACL PARTICLES FILIFORM CORROSION STEEL

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References

Gustafsson

M. E. R.

and Franks

L. G.

: Atmosphe. Environ., 1996 30 977–989.

Neufeld

A. K.

Cole

I. S.

Bond

A. M.

and Furman

S. A.

: Corros. Sci., 2002 44 555–572.

Zhang

Wang

and Wang

: Electrochem. Commun., 2005 7 443148.

Zhang

Wang

and Wang

: Corros., 2005 61 1167–1172.

Weissenrieder

and Leygraf

: J. Electrochem. Soc., 2004 151 B165—B171.

Chen

Z. Y.

Zakipour

Persson

and Leygraf

: Corros., 2004 60 479–491.

Chen

Z. Y.

Persson

Nazarov

Zakipour

Thierry

and Leygraf

: J. Electrochem. Soc., 2005 152 B342—B351.

Chen

Z. Y.

Persson

Samie

Zakipour

and Leygraf

: J. Electrochem. Soc., 2005 152 B502—B511.

Chen

Z. Y.

Persson

and Leygraf

: J. Electrochem. Soc., 2005 152 B526—B533.

10.

Tsuru

Tamiya

K. I.

and Nishikata

: Electrochim. Acta 2004 49 2709–2715.

11.

Dubuisson

Lavie

Dalard

Caire

J. P.

and Szunerits

: Electrochem. Commun., 2006 8 911–915.

12.

Dubuisson

Lavie

Dalard

Caire

J. P.

and Szunerits

: Corros. Sci., 2007 49 910–919.

13.

and Hihara

L. H.

: ‘Study of atmospheric corrosion initiation from pre-deposited NaCl particles on steel exposed to high humidity’, Report 1645 214th ECS meeting Honolulu, Hawaii, USA 2008.

14.

Uhlig

H. H.

Triadis

D. N.

and Stern

: J. Electrochem. Soc., 1955 102 59–66.

15.

Evans

U. R.

: ‘Corrosion and oxidation of metals’118; 1960

London

Arnolds.