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Best Passivation Method

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dchu129

Mechanical
Joined
Jan 30, 2012
Messages
18
Location
US
Here I have at my work place the passivation process.

It would work for most of the time with new solution but only last for a month or so and parts would start failing and the phosphoric acid would need to be change.

For more complicated parts (bigger and more edges/holes made from NC), it would fail very often even with new solution.

Wondering what would be the problem.

Here is general process

Electro Polish with current through 5 mins
Rinse
Phopsphoric Acid 5 mins
Rinse
Type 2 Passivate 30 mins
Rinse
Dichromate Treatment 30 mins
Rinse
Hot Water Seal 1 mins
Spin Dry
 
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