plating, anodizing, & finishing Q&As since 1989
Locking in the brightened brass/copper shine
July 20, 2010
Belonging to a progressive organisation engaged in production of various types of parts & equipment made from brass and copper, I mostly confront with the situation where our products return to dim and dark position (as of pre- brightening stage) some times quite quickly whereas at occasions it takes a few days for the polish to diminish.
Equipment supplier - Lahore, Punjab, Pakistan
July 24, 2010|
A. You need to utilize a tarnish preventive compound among other possible steps i.e. packaging,storage,etc.Gene Packman
- Great Neck, New York
July 26, 2010
A. Sounds very much like poor rinsing or failure to dry quickly and adequately. I am guessing that these products are being treated in bulk. Parts need good movement in rinses to ensure that they acid-free. Suggest that you improve rinsing and then to give them a degree of additional tarnish resistance, wash in benzotriazole or soap solution followed by more rinsing. The final rinse should preferably be hot to aid drying and improve water repellency. Note these treatments are not a substitute for good rinsing in the first place.
- Birmingham, UK