| 摘要 |
PROBLEM TO BE SOLVED: To prevent the corrosion of a clearance between metal members by an easy means by providing a corrosion prevention layer which is made of a material having larger ionization tendency than an iron-based material and has a specific thickness between the member and a seal. SOLUTION: A clearance corrosion prevention structure is constituted by providing a corrosion prevention layer 6 having a thickness of 0.01 to 0.5 mm between a member 2 and a seal 3 and tightening the members 2, 2 by a bolt 4 and a nut 5 to keep pressure. Since the corrosion prevention layer 6 has larger ionization tendency than an iron-base material constituting the member 2 and is chemically unstable, oxygen which enters between the member 2 and the seal 3 reacts with the corrosion prevention layer 6 in priority to melt the corrosion prevention layer 6 in priority. As a result, a cathode current is given in a blocked part, and the oxygen consumed to generate a current can escape from the blocked part so as to prevent the corrosion between the member 2 and the seal 3. |
