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ASTM 28B Corrosion Testing

ASTM 28B Corrosion Testing

ASTM 28B Corrosion Testing

(OP)
I am currently testsing some nickel alloy samples in ASTM 28B (H2SO4, HCl, CuCl2, FeCl3)solution.  After one test it turned dark green.  I kept using the same solution to see whether it has still corrosivity to corrode samples.  I have done 3 tests but still it seems to give some results.  The ASTM standard does not tell when to change solution.  My questions are
1. How many tests/samples can the solution handke before discarding?
2. How do I know the solution is no good?  Any easy method to find out - pH measurement, etc?
3. How do I safely dispose the used solution?
4. How to avoid (thin) copper coating on samples?

many thanks.

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