| 摘要 |
PURPOSE:To form a metallic plating layer having adequate dendrite ruggedness on the wall surface of a heat transmission pipe by mixing oxygen with a plating liquid added with an oxyethylene surface active agent and a low concn. of chloride ions just before the heat transmission pipe and admitting the liquid into the heat transmission pipe. CONSTITUTION:The heat transmission pipe 10 and fins 3 are tentatively fitted in the specified position. The pipe 10 and the fins 3 are press welded by expanding the pipe 10. The pipe 10, a connecting pipe 11 and a circulation pump 12 are combined and the acidic copper sulfate plating liquid 9 added with the oxyethylene surface active agent and a low concn. of chloride in a plating cell 7 is circulated into the pipe 10. Positive electric charge is thereupon applied to a counter electrode 14 formed by plating platinum to a titanium bar by a DC power source to use the same as the anode side. Negative charge is applied to a connecting terminal 15 as the cathode side. The plating liquid 9 is mixed with the oxygen generated by electrolysis from the electrode 14 and is admitted into the pipe 10 to form the rugged plating layer on the inside wall surface thereof. |
