溶解塩による各種鋼の腐食について

概要

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Hereunder is given a report of the investigation made of the corrosion of various kinds of steels of commercial type owing to the action of molten salts used as heat exchange medium in chemical industries, not the salts used for heat treatment in metal industries. Study was made also of the effects of carbon and silicon ingredients on the corrosion resistance. The following molten salts were used : (a) NaNO_3-KNO_3-NaNO_2, (b) NaNO_3-KNO_3, (c) LiCl-ZnCl_2-BaCl_2-CaCl_2-NaCl, (d) NaCl-BaCl_2-CaCl_2 The test temperatures were 400℃, 500℃ and 600℃. The results obtained are as follows : (1) In the salts (a) and (b), increase in chromium content of steels, largely improves corrosion resistance of the steels. Rimmed steel is better than killed stee l. Influences of carbon and silicon contents on the corrosion resistance appear at above 500℃. That means that the corrosion rate increases with carbon content up to about 0.16%, then decreases. Silicon also increases the corrosion rate up to about 0.2-0.4%, and then decreases it. Aluminized steel shows the resistance as well as stainless steels. (2) Chlorides such as salts (c) and (d) are more aggressive than nitrate salts (a) and (b) below 500℃. The use of chlorides below 500℃ is thought to be undesirable. In molten chlorides, chromium alloying to steels is not so effective as in nitrate salts.
社団法人日本材料学会の論文
1968-08-15