| 摘要 |
PURPOSE:To prevenet an electrolytic corrosion of a screwed coupling by a monolithic molding of a collar wherein a cramp-screw is screwed in, and a cramp bracket with a kind of metal same as that for the cramp screw. CONSTITUTION:A cramp screw 7 and a collar 6 are made of stainless steel, and the collar 6 is insert-molded to a cramp bracket 4 of an aluminum alloy, and the screwed coupling of the cramp screw 7 and the collar 6 is of a same metallic composition, thus not causing an electrolytic corrosion, and a crevice corrosion neither as stainless steel are being used. A different kind of metal is contacted each other between the collar 6 and the cramp bracket 4, while there is no crevice for the sake of a monolithic molding, and no water will permeate to be an electrolyte. Hence, neither electrolytic corrosion nor crevice corrosion will take place. |
