Thin steel plates galvanized are used for steel-framed house, roof and wall and their metal fittings of building structures. Bolts generally used to join metal fitting have zinc galvanized specification which is classified into electro-galvanizing coatings of zinc on steel, hot dip galvanized coatings on steel. Corrosion occurs in not only metal fittings but also bolts, caused by the presence of moisture and oxygen, depending on the environmental conditions. The degree and form of the corrosion is different. In this paper, the combined cyclic accelerated corrosion test of galvanized bolts of the roof metal fitting and tensile test are conducted. Tensile strength of galvanized bolts under corrosion is evaluated.
