The Use of the Hydrogen Permeation Apparatus to Evaluate Paint Stripping Compounds

摘要

Based on the experimental work described in the report, the following conclusions were made: (l) The hydrogen permeation apparatus was not significantly more sensitive to hydrogen produced by the paint strippers than the Lawrence Hydrogen Detection Gauge although the permeation specimen was exposed only 10 minutes whereas the probe was exposed 6 hours. (2) While not reproducible to the degree desired, the Lawrence Gauge is, at present, easier to use with paint strippers than the permeation apparatus and about 4 times as many tests can be made in the same period of time (1 day). (3) The presence of a cadmium deposit on the metal surface greatly increases the production of hydrogen when the aggressive strippers are applied. (4) The use of notched high strength C-rings is still a reliable way of evaluating the embrittling characteristics of chemical treatments. (5) If a process causes deleterious effects by means other than hydrogen embrittlement, as may well be in the case of paint strippers, then a specimen such as the notched C-ring, which simulates service conditions, would be a better choice than the instrumental methods described. (Author)