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Trial Number 7

Trial Purpose:

Third attempt to identify products that will brighten the brass parts after removing the paint.

Date Run:

10/19/2001

Experiment Procedure:

Two products were selected based on vendor supplied information for removal of oxides and rust.  The solutions were used at full strength at room temperature and 120 F.  One brass part, free of paint, was immersed into each cleaner.   Observations were made at 5 and 10 minutes.  At the end of the 10 minutes, the parts were rinsed in tap water at 120 F and wiped dry with a paper towel.

Trial Results:

Both products did show signs of brightening the brass parts.  The increased temperature improved the results for each product.  Table 1 lists the observations made.

Cleaner Observations
Coil Bright

Did not work well at room temperature

Did brighten parts when at 120 F

Lime Scale Remover

Some brightening at room temperature after the 10 minutes

Worked better at 120 F.  Less than 5 minutes for noticeable brightening.

Coil Bright (68 F) 3
Coil Bright (120 F) 2
Lime Scale (68 F) 3
Lime Scale (120 F) 1

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

Brightening was moderately successful at an increased temperature for both products evaluated.

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