Atmospheric Corrosion of Structural Steel and Hot Dip Galvanized Structural Steel in Saraburi, Chonburi and Songkhla, Thailand

Abstract

The investigation of corrosion for structural steel grade SS400 and hot dip galvanized structural steel has been conducted in 3 different provinces in Thailand, Saraburi for the rural agriculture environment, Chonburi for the industrial environment, and Songkhla for the coastal environment. The exposure period of specimens was 3 months, 6 months, and 12 months from March 2020 to March 2021. Environmental conditions such as temperature, relative humidity, and rainfall were monitored monthly averaged. Pollution parameters such as chloride and sulfur dioxide were monitored 6 months averaged. The corrosion rates are calculated by the weight-loss method. The result showed that SS400 structural steel has a significantly large value of corrosion rate than hot dip galvanized structural steel in 3 provinces. The specimens in the coastal environment showed more corrosion rate than in industrial and rural agriculture environments. The life cycle cost of the steel structure constructed with these two materials was compared, and the result can be used for material consideration and service life design of steel structures.