High temperature corrosion of MgO-stabilized ZrO2, MgO, Alumina, and Mullite on the market in chlorine and hydrogen chloride gases at 1273K has been investigated. MgO is converted into chlorides and the products volatilized, which leads to the weight loss of specimen. In the case of MgO-stabilied ZrO2, the depletion of MgO in the outer surface region of specimen leads to an increase in the amount of monoclinic ZrO2. Because the purity of alumina and mullite on the market is high enough, the corrosion resistance is quite excellent.
