大気環境における球状黒鉛鋳鉄の腐食特性に及ぼすSi 及びCuの影響

<p>  This study aims to investigate the corrosion characteristics of spheroidal graphite cast iron in an atmospheric environment and compare them with those of carbon steel and weathering steel. The atmospheric exposure test results showed that the corrosion rate of spheroidal graphite cast iron is significantly lower than that of carbon steel and less than or equal to that of weathering steel. The main reason for the differences in the corrosion rate of the three materials should be due to the high protectiveness of the rust layer.</p><p>  Previous research suggests that Si and Cu contribute to the rust protection of spheroidal graphite cast iron, but the details are unclear.</p><p>  In this study, an atmospheric exposure test was conducted using specimens with minimal additions of Si and Cu to confirm their effects on the corrosion behavior of spheroidal graphite cast iron in an atmospheric environment.</p><p>  The results showed that the corrosion rate of the specimens with added Si was significantly lower than that of the specimens with minimal addition of Si. It was also revealed that Si was concentrated in the oxide state in the inner layer of the rust, especially around graphite.</p><p>  In addition, the corrosion mechanism of spheroidal graphite cast iron in an atmospheric environment was studied, considering the effects of Si and Cu.</p>