亞鉛メッキ附着量試驗の檢討
線材について
1950 年 1 巻 5-6 号 p. 25-31
詳細
1950 年 1 巻 5-6 号 p. 25-31
Three methods of testing the average thickness of Zinc coating on iron wire, i. e. HCl-SbCl3 metlhod, Eiectrolytic method, & Gas-evolution method were compared. Samples used were, No. 1-hot dipped at 480°C, No. 2-at 600°C, No. 3-at 450°C without wiper, No. 4-at 450°C, and No. 6. 7. 8- electroplated ones.
Results obtained:
1) As the electrolyte for the electrolytic method, Britton's solution containing NaCl was found to be better than 1N-ZnSO4 solution.
2) In the gas-evolution test, dil.-H2SO4 (5% for hot-dipped, 10% for electroplated) must not conain arsenious oxide.
3) The electrolytic method gave smaller values than those of HCl-SbCl3 method, and the gas-evolution method gave greater values.
