AES Research Project 3, Adhesion of Electrodeposits, Part 3, Publications Review on Measurement
This is Part 3 of a four-part article consisting of the full report of AES Research Project #3, Adhesion of Electrodeposits, done at the University of Michigan in the mid-1940s, following the end of World War II. It reviews the published methods for measuring adhesion.
Project Director: A.L. Ferguson
Associate: Elmer F. Stephan
Chemistry Department, University of Michigan, Ann Arbor, Michigan
Part 3. Correlated Abstract of Published Methods for Measuring the Degree of Adhesion
This is Part 3 of a four-part article consisting of the full report of AES Research Project #3, Adhesion of Electrodeposits, done at the University of Michigan in the mid-1940s, following the end of World War II. It reviews the published methods for measuring adhesion. A printable version of this section can be downloaded by clicking HERE.
Before discussing in detail the various methods for measuring adhesion, it is well to survey the situation in a general manner. This can best be done by stating the remarks of a few authorities in their own words.
In his discussion of a paper by A.W. Hothersall,43 F.N. Speller (Director of Research, National Tube Co., Pittsburgh, Pa.) summarizes the adhesion situation in the following two sentences:
"It seems to me that two things particularly stand out in this discussion. We need to know more about the fundamental nature of the bond between a surface layer and the metal itself, and, in the second place, we need some practical test of adhesion. It is a wonder that we have been able to get along so well without some kind of a standard method of testing adhesion."
F.C. Mesle,96 of Oneida, Ltd. has the following to say:
"In my judgment, one very essential quality test for electroplating is for the adhesion of the deposit. Stress has been put on thickness specifications and rightly so, but if thickness specifications are to have value, and are intended to protect the base metal from corrosion, it is equally important that specifications for adhesion also be developed.
"In general, if the deposit does not peel or blister in the finishing operations, it is assumed that the adhesion is satisfactory. Factory tests on samples, such as bending, twisting and burnishing, may, in a general way, indicate a satisfactory adhesion of the deposit, but the fact still remains that much plating is done which lacks the needed adhesion to give satisfactory service or to adequately protect the base metal from corrosion. Look over the automobiles parked in most any lot and you will have proof of this.
biles made during the last five years, and found 29 per cent of these cars to have rusty bumpers because the plate had a poor adherence. From eleven of these cars, I could peel the plate with my fingers and get pieces large enough to measure the thickness, which was as follows: