塩化水素ガスおよび塩素ガス雰囲気中におけるクロム鋼の腐食について
1970 年 19 巻 8 号 p. 340-345
詳細
1970 年 19 巻 8 号 p. 340-345
The corrosion of Cr steels containing 5 to 30% Cr exposed to dry hydrogen chloride gas and to dry chlorine gas at elevated temperatures was investigated.
The results obtained are as follows;
1) In hydrogen chloride at any temperatures below 500°C, 13% Cr and 18% Cr steels have the highest corrosion rates of all the specimens tested. At longer exposure times, there is a tendency for Cr steels to decrease in corrosion rates with time. This is related to the formation of protective surface films which mainly consist of ferrous chloride.
2) Cr steels are corroded more severely in chlorine than in hydrogen chloride gas. Mild steel is found to ignite in chlorine gas above 250°C. The addition of chromium improves the corrosion resistance to chlorine gas effectively. The corrosion rates obtained in short exposure time are nearly equal to ones in longer exposure time. This is concerned with volatility or melt of the corrosion products.
3) Corrosion rate increases more rapidly in chlorine gas with rise of testing temperature than in hydrogen chloride gas.
