Eleven cleaning formulations were selected from the laboratories supply. Ten were used at 100% and at room temperature (75 F). A plastic eye dropper was used to place a small amount of the solutions onto the part's surface and allowed to soak for 1 minute. At the end of the soaking, the solution was wiped off using a swab. The part was observed for any signs of cleaning. One product, sodium bicarbonate, was used in a media blasting unit. The part was cleaned for 1 minute at room temperature at a pressure around 100 psi.
Contaminant: White powders (SiO2, NHCl, (NH4)2SiF6, or NH4HF2)
Trial Results:
At first glance, most of the products looked like they cleaned the white powder from the metal part. After the liquids dried, the white powder returned. A couple of products left less white powder than was already there. The media blasting with sodium bicarbonate was very successful in removing the white powder. The blasting also removed the green paint from the side of the part. The following table lists the observations made during the trial.
Table 1. Cleaning Observations
Multikleen 1568
Appeared to dissolve powders, after drying part was still white
Lifted out dirt and green specks
Shopmaster
Appeared to dissolve powders, after drying part was still white
Less white than start-lifts dirt
Inproclean 3800
Appeared to dissolve powders, after drying part was still white
Lifted out dirt and green specks
Amberclean 526L
Smudges powder
Lifted out dirt and green specks
Beyond 2001
Appeared to dissolve powders, after drying part was still white
Less white than start-lifts dirt
Coil Bright
Little powder dissolving
Valtron SP 2700KB
Smudges powder
DS 108
Appeared to dissolve powders, after drying part was still white
Evaporates fast
Uni Clear II
Appeared to dissolve powders, after drying part was still white
Bio T Max
Appeared to dissolve powders, after drying part was still white
Sodium Bicarbonate
Removes white powder, removes green paint from surface
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
The five cleaners that were more successful will be evaluated at the client's current operating conditions of 20 minutes and 140 F. One part will also be cleaned fully with media blasting.
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