Nondestructive Method of Testing for Plating Porosity of Inside Surfaces of Electrical Connectors
Original Publication Date: 1980-Aug-01
Included in the Prior Art Database: 2005-Feb-13
Electrical connectors used in computer circuits have been refined to a set of critical parameters that must be maintained to assure reliable performance. A noble metal contact surface that is free of defects is one of those parameters. Measurement of that parameter for receiving inspection and life tests has been a problem, the solution to which resulted in several tests. Among the tests are nitric acid vapor, sulfur dioxide gas, the electrographic gel and electrographic paper test. Each test uses different means to achieve the same result, but remains sensitive to operator judgment. Compounding the operator-judgment problem, the extremely small size of the gold-plated surface and the location of the surfaces of interest on the inside diameter of a hollow cylinder have made it impossible to make accurate tests for porosity.