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RISS 인기검색어
- 검색키워드
- 저자 : Bhamornsut, C. (검색결과 2 건)
- 무료
- 기관 내 무료
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Initial Stage of Atmospheric Corrosion of Carbon and Weathering Steels in Thailand Climate
Nii, K.,Bhamornsut, C.,Chotimongkol, L.,Vutivat, E.,Nakkhuntod, R.,Jeenkhajohn, P.,Suphonlai, S. 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.4
Corrosion of carbon and weathering steels were evaluated under 3 environmental exposures in Thailand(urban, rural and arine) for a year. The seasonal study was designed to determine different corrosion mechanisms by 6 months of dry season and 6 months of rainy season in a year. The sheltered exposure racks were used to determine the washing effect of rain. At each site, climatic and pollutants analyselwere carried out. The present study showed that the difference in corrosion rates of carbon and weathering steels was not so distinguished in both mal (AIT) and urban (TISTR) environments. The corrosion rate of weathering steel was somewhat lower than that of carbon steel and the decreasing tendency of corrosion rate with time was slightly higher for weathering steel than for carbon steel. In marine (Rayong) environment, the corrosion rate was higher and the effect of wet and dry seasons was obsewed.The corrosion rate in 6 dly months was higher for direct exposure than Tor sheltered exposure. However, in 6 rainy months, the corrosion rate of sheltered exposure was higher than that of direct exposure. In direct exposure fur 1 year, that is, the first 6 dry months and the next 6 rainy months, the corrosion rate decreased with timc, but in sheltered exposure, the corrosion rate did not decrease with time, instead, increased in the next 6 rainy months. This indicated that the protective layer formed in the first 6 dry months could be destroyed by high deposition of chloride for sheltered exposure in the next 6 rainy months; whereas the rust layer for direci exposure could be kept sound due to washing effect in rainy season, even though the deposition rale of chloride was almost the same for direct and sheltered exposures. In marine environment, the weathering stecl showed hi&er corrosion resistance than carbon steel but its corrosion rate was higher than those in other environments.
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Mechanism and Rates of Zinc Corrosion in Tropical Countries
Cole, I. S.,Ganther, W. D.,Furman, S. A.,Neufeld, A. K.,Lau, D.,Chotimongkol, L.,Bhamornsut, C.,Purwardia, S.,Hue, N. V.,Bernardo, S. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.6
A five-nation study has investigated the rate and mechanism of atmospheric corrosion of zinc in Australia, Indonesia, Thailand, The Philippines and Indonesia. During this study, 18 sites were established in these countries including severe marine, marine, severe industrial, industrial, marine/industrial, urban and highland sites. At each location, zinc plates were exposed for three-month periods and for one year. Further, a wide range of climatic and surface response parameters was measured at each location including gaseous SOx and NOx, airborne salinity, RH and temperature, rainwater composition, surface temperature and time of wetness (TOW). Exposed plates were used to determine mass loss, the nature of corrosion products (using FTIR and SEM-EDS) and the morphology of the corrosion layers (via SEM-EDS). Laboratory experiments were also carried out to elucidate the factors controlling oxide formation and stability. Regression analysis indicated that the prime factors controlling zinc corrosion were climatic (temperature and rainfall) and surface response (TOW), and surprisingly not pollutant levels. This was despite a high levels of variation in SOx levels across the sites. The possible reasons for this observation are discussed.
ScienceON
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