Abstract
Ordinarily used stainless steels, of which SUS 304 is typical, are used as building materials and fitting metals mainly from a point of corrosion resistance. Atmospheric corrosion behaviors (increase of rust area ratio and growth of pit depth) depend on the climates of building sites, structures and parts of buildings. The purpose of this paper is to investigate correlation between an exposure test and acceleration tests on 11-18% chromium content stainless steels, and suggest an atmospheric corrosion estimation method. On four domestic sites, including Okinawa, changes in SARN (Stainless steel association rating number) and pit depth distribution are investigated. The cyclic corrosion test in which the artificial sea water spray test, the dry test and the humid test are the series, is shown to be applicable to the estimation of change in SARN and maximum pit depth of stainless steels in a beach atmosphere. And the correlation equation and coefficients between exposure tests and the acceleration test are determined.
