亞鉛鍍金鋼板に於ける酸洗抑制劑の影響
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概要
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Pickling inhibitors are the agents which may be added to an acid pickling solution both to diminish the attack of acid on metallic area from which the scale has been removed, without appreciably retarding the rate at which the acid removes scale or rust, and diminish the vaporization of acid fume, so that the inhibitor has following advantages, ……reduction in metal loss, saving of pickling acid, prevention or minimizing of scrap losses from overpickling, decreases the blistering and the hydrogen embrittlement, etc. In our country, however, the inhibitor was not used on the hot galvanizing practice. Because of inferior finish of coated metal that had no or very small spangle, and dull finish. It was important to have some method of researching or testing the inhibiting layer and its aftertreatments before hot dipping. The authors investigated electrochemically the inhibiting layers. In laboratory test, the inhibiting layers were easily removed and the fine hot galvanized finish was obtained. In the authors' tests, as the acid inhibitors, Xylidine, Quinoline, Rohdine, Restin, Picknock were used and measured in the 10 per cent sulfuric acid solution with or without 1 per cent inhibitors. The electrode potentials and galvanic currents of iron sheets against calomel electrode with or without inhibiting layers, in the acids, neutral salt solutions and alkaline solutions, were measured. These values indicated the surface activities of the iron sheets. When the potential values was noble or current value was low, the surface was not active and in this case, the zinc-coating was not fine, but when the surface potential value was baser or current value was high, the surface was active and perhaps the inhibiting layer would be removed from the metallic surface, and in this case the zinc-coating was in general very fine. After acid pickling with inhibitors, the iron sheet must wash perfectly with water and dilute alkaline solution, then wash again with water and dilute hydrochloric acid solution. In such treated sheet, the inhibiting layer on metal surface was removed almost perfectly and good coating could be obtained.
- 社団法人日本鉄鋼協会の論文
- 1952-11-25
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