Metal finishing Q&As since 1989
Type 3 Hardcoat Anodizing Slows Down after Long Runs
Q. Good morning.
Seeking help on our T3 anodizing line and performance issues. Occasionally we run our line in 24 hour shifts and by the 72nd hour the anodizing times will slow down by about ten minutes. Doesn't seem to matter what size load, amps, part shape, acid/aluminum content is, it just slows down and it's always after the third day of running. One item we do notice is when we take samples for testing during the 24 hour runs, there seems to be a lot of air/gas in the sample. We do have air sparging in every station and with 12 eductors pushing about 90 GPM of sulfuric acid thru the tank, that recirculates thru one transfer tank and a heat exchanger, chilled to about 24 °F. The actual process tanks will cool to about 28 °F and end of anodizing will be about 32/34 °F.
This problem always goes away when we let the line rest for minimum 24 hours, then our times will go back to normal. Thank you in advance for your time.
Anodizing MGR - Spokane Valley, Washington
November 13, 2015
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