Abstract
A continuous microscopic observation method for a certain definite point on the surface of electroetched chromium deposits was studied and the following results were obtained.
The width and number of cracks increased by etching, but cracks once produced never disappeared. When these cracks were observed with a scanning microscope, some cracks, which had come across a crack enlarged by etching, were more etched and developed in tunnel form.
Non-clear network patterns as well as clear cracks were observed with an optical microscope on the surface of bright chromium plating. These non-clear network patterns corresponded with the cracks produced by electroetching. Therefore, the non-clear patterns observed on the surface indicated all the cracks existing inside the chromium deposits.
