| 摘要 |
PURPOSE:To improve corrosion resistance by forming a protective film comprising a vapor-phase plated layer and the polymer film of vapor-phase p-xylylene or p-xylylene chloride which is continued from the plated film on the surface of the sintered body of rare-earth-element (including Y)-boron-iron based alloy having the porous surface. CONSTITUTION:Them main components of rare-earth-iron based alloy to be protected are 8-30 atomic% rare earth element, 2-28 atomic% boron and 42-90 atomic% iron in general. The alloy is obtained by sintering. A protective film has a double-layer structure. The first layer comprises a vapor-phase plated layer. The second layer comprises the polymer film of vapor-phase p-xylylene or p-xylylene chloride. The first layer of the protective film is the vapor-phase plated layer which is directly formed on the surface of the rare-earth-iron based sintered alloy that is a porous material. The second layer of the protecting film is formed on the surface of the first layer of the protective film. The second layer is the polymer film of the p-xylylene and the polymer film of the p-xylylene chlorided. |
