Pitting of zinc: Observations on atmospheric corrosion in tropical countries

摘要: Abstract A five-nation study has investigated the mechanisms and rates of atmospheric corrosion zinc steel in tropical regions Australia, Thailand, Indonesia, Vietnam The Philippines. For study, 18 exposure sites encompassing severe marine, industrial, marine/industrial, urban highland environments were established across countries. At each location, plates exposed for periods three months one year, measurements taken a wide range surface-response climatic parameters, including gaseous SOx NOx, airborne salinity, relative humidity (RH) temperature, rainwater composition, surface temperature time wetness (TOW). Exposed used to determine mass loss, nature products (using FTIR SEM-EDS) morphologies layers (via SEM-EDS). Regression analysis indicated that prime factors controlling rate climate (temperature rainfall) (TOW), surprisingly not pollutant levels, despite significant variation levels sites. SEM studies presence pitting below oxide on zinc, particularly those at marine other with relatively low levels. In contrast, no was observed (or pits had very aspect ratios) specimens high possible processes leading damage patterns are discussed.