Assessment of Atmospheric Corrosivity at Jeju Island

J. Ocean Eng. Technol. 2005;19(5):50-57.

KIM GUI-SHIK;YANG KYEONG-CHO;HU CHUL-GOO;SONG JEONG-HWA;

Faculty of Mechanical, Energy and Production Eng, Cheju Nat'l Univ.;Department of Mechanical Eng, Graduate School, Cheju Nat'l Univ.;Department of Civil and Environmental Eng, Cheju Nat'l Univ.;Department of Environmental Eng, Graduate School, Cheju Nat'l

제주도 대기환경의 부식성 평가

김귀식;양경조;허철구;송정화;

제주대학교 기계에너지생산공학부;제주대학교 기계공학과 대학원;제주대학교 해양과학부 토목환경공학;제주대학교 환경공학과 대학원;

Keywords: Atmospheric Corrosion, Time of WetnessTOW

핵심용어: 대기부식

Abstract

This study has been conducted to investigate corrosivity of carbon steel, Cu, Zn and Al for one year from Sept. 2003 to Aug. 2004. A model of ISO 9223-ISO 9226 that represents the relation between metal corrosions and environmental parameters was used for atmospheric corrosion evaluations. Environmental parameters for these evaluations are time of wetness(TOW), $SO_2$ and Chloride. Corrosion rates for four metals which are exposed indoors and outdoors were measured on five locations in Jeju Island; Gosan, Seogwipo, Seongsan, Chuna hill and Jeju city. The environmental factor of atmospheric corrosion of Jeju Island for $SO_2$ class is P0, a clean area. TOW as T3 and T4 indicates that Jeju has the characteristics of a tropical area. Chlorides class within 3 km from the coast show the features of costal area as S2 and S3 classes. Chuna hill show the features of woodland as a S1 class. In Corrosion classes of each site which was measured outdoors is higher than indoors. Gosan is the highest class as the rank of C5, and indicated that they're ranked as C3 or C4.