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I'm using the following steps for treating my aluminum parts:
- scrub clean with Acetone and scotchbrite
- dry
- scrub clean in Metalprep-79 and scotchbrite
- rinse in water
- repeat until water forms smooth sheet (water break test)
- dip in alodine 1201 until part turns golden brown
- rise in water
After the final rinse, the golden brown coating feels soft and
delicate, and could be rubbed off easily. I've to hang the part and
let it completely dry before touching it.
Now, I can remove the alodine by scrubbing the part again with
Metalprep-79 and recover its original shiny surface. If it repeat the
above surface treatment all over again, I get a more stable coating
that looks more uniform and not so soft, and also appears slightly
darker in color.
I'm not sure if I understand why this is happening. This has happened
every time I tried it, not just once, so it isn't a random occurence.
Why is the re-coat giving me better results than the first-time coat?
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Question about Alodine 1201
