Structural Body and Electric-Corrosion Prevention Method for the Same

Abstract

A structural body of the present invention comprises a first member ( 1 ) having a first outside end portion ( 10 ) in which a first metal element is adapted to a major component; a second member ( 2 ) having a second outside end portion ( 20 ) in which a second metal element, being different from the first metal element, is adapted to a major component, and which is disposed to contact with the first outside end portion ( 10 ); and a coating member ( 3 ) comprising a coated film, at least whose outside superficial portion is composed of a fluoropolymer substance, and coating at least a part of both first outside end portion ( 10 ) and second outside end portion ( 20 ) so as to cover the contact portion ( 50 ) between them. Moreover, an electric-corrosion prevention method of the present invention, in the aforementioned structural body, inhibits the development of electric corrosion, which might possibly occur so as to stride over the contact portion ( 50 ) between the first outside end portion ( 10 ) and the second outside end portion ( 20 ), by hindering the electric conduction between the first outside end portion ( 10 ) and the second outside end portion ( 20 ) by means of the coating member ( 3 ). In accordance with the structural body and electric-corrosion prevention method of the present invention, the electric corrosion between members of different metals can be prevented effectively.

1 . A structural body, being characterized in that it comprises: 
 a first member having a first outside end portion in which a first metal element is adapted to a major component;    a second member having a second outside end portion in which a second metal element, being different from the first metal element, is adapted to a major component, and which is disposed to contact with the first outside end portion; and    a coating member comprising a coated film, at least whose outside superficial portion is composed of a fluoropolymer substance, and coating at least a part of both first outside end portion and second outside end portion so as to cover the contact portion between them.    
   
   
       2 . The structural body set forth in  claim 1 , wherein said coating member includes a sealing layer, which is made by applying a fluorine-based sealing agent and then curing it.  
   
   
       3 . The structural body set forth in  claim 2 , wherein said sealing agent is a liquid fluorocarbon rubber.  
   
   
       4 . The structural body set forth in  claim 2 , wherein said sealing layer is such that the thickness is 100 μm or more.  
   
   
       5 . The structural body set forth in  claim 1 , wherein said coating member is such that the width, which goes over said contact portion, is 10 mm or more.  
   
   
       6 . The structural body set forth in  claim 1 , wherein said first metal element or said second metal element is Mg.  
   
   
       7 . The structural body set forth in  claim 1 , wherein said first metal element is Mg, and said second metal element is Fe.  
   
   
       8 . The structural body set forth in  claim 7 , wherein said first member is a rear housing for a compressor, and said second member is a gasket therefor.  
   
   
       9 . An electric-corrosion prevention method for structural bodies, being characterized in that, in a structural body comprising: a first member having a first outside end portion in which a first metal element is adapted to a major component; a second member having a second outside end portion in which a second metal element, being different from the first metal element, is adapted to a major component, and which is disposed to contact with the first outside end portion; and a coating member comprising a coated film, at least whose outside superficial portion is composed of a fluoropolymer substance, and coating at least a part of both first outside end portion and second outside end portion so as to cover the contact portion between them, 
 the development of electric corrosion, which might possibly occur so as to stride over the contact portion between the first outside end portion and the second outside end portion, is inhibited by hindering the electric conduction between said first outside end portion and said second outside end portion by means of said coating member.