Not plating along edges?? whats wrong

[MrPontiac]

I am trying to copy cad a choke plate off a 4 bl. carb. ive done it at least 6 times with no troubles, Now it does not seem to want to plate along the outside edges, plating is irregular edges are dark gray in color, Ive plated at least 6 of them before at 1.6 amps and .9 volts with no troubles. Temp. is at 105, i glassbeaded parts, pickled them, rinsed with distilled water and plated, could my pickle solution be to strong?? I just changed it?? Im worried my copy cad solution has gotten weak on me.

[MrPontiac]

I forgot to mention that ive tryed increasing amps in small incremants, then whole part turns dark gray at 1.8 to 2.0 to much amps

[MrPontiac]

Part measure,s 3 inched long and 1- 1/2 wide and my ph is at 6.2

[seanc]

Sounds to me like too much current to begin with. The dark gray is evidence of burning.

3" x 1.5" x 2-sides is 9 sq-in, @.14 ASI gives 1.26 amps. Why did you choose 1.6?

The edges of large flat pieces are higher current density areas, so get more of it to begin with.

Sean

[MrPontiac]

I guess ive written down what worked for me before, i have 1.6 so now ill change and see what happens. Thanks for your reply.