EFFECT OF HEIGHT ON THE MARINE ATMOSPHERIC CORROSION OF STEEL
Marine atmospheric corrosion poses a great threat to coastal installations and structures such as cranes, helidecs and other aerial components of offshore platforms. However, the degree of attack on the structures varies greatly at various heights above sea level. The present study is aimed at providing a better understanding of the deterioration of steel at various heights above sea level. Observations were made at a coastal and an offshore location on the west coast of India, by exposing steel coupons at different heights for different exposure periods; subsequent corrosion rates were determined by the weight-loss method. The corrosion rates of steel at both the stations were found to decrease with increase in height above sea level. The decrease in corrosion rate with respect to increased height is thought to be due to the variation in the salt penetration at various levels above the sea's surface. The increase in corrosion rate for an extended exposure period at the coastal station is attributed to the wetting of coupons by heavy rain. The lack of correlation between the amount of salt and extent of corrosion at 2-m height at the coastal station is attributed to the high wind speed which prevailed at this level, thereby preventing the slat from forming an electrolyte. At the offshore station, the corrosion rate decreased with increased exposure period. The rust product on the surface of the coupon might have prevented the further action of the corrosive factors.
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Supplemental Notes:
- Corrosion Prevention & Control, v 38 n 3, June 1991, p 75 [3 p, 4 ref, 2 tab, 5 fig]
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Authors:
- Sawant, S S
- Wagh, A B
- Publication Date: 1991
Language
- English
Subject/Index Terms
- TRT Terms: Steel
- Old TRIS Terms: Atmospheric corrosion
- Subject Areas: Marine Transportation; Materials;
Filing Info
- Accession Number: 00700891
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Aug 14 1995 12:00AM