Abstract
1. When choosing the composition of a salt for metal heat treatment, it is necessary to consider the corrosion activities of the molten salts in relation to the metal being heat treated. 2. Corrosion activity of the molten bath can be decreased by strictly following the rules required for their operation, i.e., storage and preparation (drying) of the salts and the rectifier prior to their loading. 3. Particular attention should be given to the selection of the bath (crucible) material: chemical activity of the crucible metal and of the heat-treated metal must be the same (or nearly the same), while the crucible lining material must be as chemically stable as possible in the molten salt used.
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