熔着による鋼面鉛被(1)

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Deposition of lead on steel surface called "Homogen Lining" have been applied widely to chemical equipments. But the coherent mechanism of lead on iron or steel surface is not evidently described yet. In addition basis studies concerning to the Hommogen technique are little obtained. Experiments have been carried out by the authors to dissolve these problems described above. The erosion of iron by molten lead proceeds remarkably at the temperature of 750-800℃ in the argon atomosphere (Fig.23 and 24) and lead wet the base metal at these temperature (Fig.5B). Polished surface of iron is microscopically disturbed as shown in Photo. 1 and 2 by the deposition of lead on iron surface with a technique similler to the Homogen Lining. It is considered that lead unite to the rough surface of iron mechanically. If steel is used as a mother metal, the pearlite region eroded severely rather than ferrite part as shown in Photo. 3 and 4. Lead cohere to steel through the irregularity caused by this pearlite attacking. When the eutectoid steel is used as a base metal, the joining surface is not rough because the surface is eroded uniformly by the molten lead. Good bonding strength is obtained also in this case though. It is not clear that the cohesion mainly due to mechanical means or to other ways. Studies on the ternary system of Fe-C-Pb are thought to be desirable. On the Hommogen Lining practice, ZnCl_2 have to be used as a flux for both lead oxide and iron oxide. The mixture of ZnCl_2 and SnCl_2 (80 : 20) is more effective though pre-heating temperature of base metal must be maintained 300℃ distinctly as shown in Fig. 1. Homogen Lining is perfomed easily according to the increase of carbon content of base steel. When cast iron is used as a base metal, heating must be done from the opposite side after the flux is applied.
社団法人溶接学会の論文
1958-04-25

熔着による鋼面鉛被(1)

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