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Ask the Experts | |||||||
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February 9, 2009 - Updated February 9, 2009 - Originally Posted Oxidation on Immersion Silver PCB'sWe are processing printed circuit boards that have an Immersion Silver finish and are seeing oxidation that is interfering with solderability. The overall thickness of the boards is 0.32". Are there specific processes on how to handle Immersion Silver PCB's that would help us avoid oxidation? R. N. |
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Expert Panel Responses | |||||||
Silver naturally tarnishes in open air, especially with chemicals present like in a PWB shop. There are a few recommendations that give to our customers in order to prevent tarnish of immersion silver finishes.
President FCT Assembly Mike Scimeca created FCT Assembly after the purchase of Fine Line Stencil, Inc., and consists of two major operations: stencil manufacturing and the manufacturing of electronic assembly products such as solder paste, flux and solder bar.
To remove oxidation or other contamination from the surface of your Immersion Silver finish, try using a low-pressure gas plasma treatment. Typically, you would use one of the following methods to accomplish this:
Global Marketing Manager Nordson MARCH Mr. Szymanski works to expand strategic alliances, strengthen partnerships with equipment suppliers, and develop future product offerings tailored to the semiconductor market.
NOTE: Mr. Szymanski is no longer working at Nordson MARCH |
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