…The temperature at which a material becomes unusable due to the excessive growth of a thick oxide film (usually called scale) caused by high-temperature oxidation is called the scaling temperature. In most cases, the scaling temperature is higher than the limit temperature of mechanical strength at high temperatures, so scale formation due to high-temperature oxidation is not a major problem for practical materials. When conditions that destroy this scale are added or when there is a substance that dissolves, abnormal oxidation becomes a problem in high-temperature corrosion. When metals are deformed under stress, the surface film is destroyed, but if the rate at which the corrosion reaction starting from the break progresses exceeds the rate at which it can be repaired, it develops into localized corrosion. … *Some of the terms that refer to "high temperature corrosion" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…高温酸化による厚い酸化物皮膜(通常スケールと呼ぶ)の成長が著しくなるという理由で材料が使えなくなる温度をスケーリング温度というが,通常の場合,高温での機械的強度の限界温度よりはスケーリング温度のほうが高いので,実用材料では高温酸化によるスケール生成はあまり問題とはならない。このスケールを破壊する条件が加わったり,溶解する物質が存在するときに起こる異常酸化が高温腐食high temperature corrosionでの問題となる。応力の存在下で金属の変形が起こると表面皮膜の破壊が起こるが,破れ目を起点とする腐食反応の進行の速度がそれを補修する速度を上回ると局部腐食に発展する。… ※「high temperature corrosion」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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