RustyME
Mechanical
- May 16, 2008
- 1
I have a few small parts that have cracking/crazing in the surface after a Hard Coat Anodize process (Type III per MIL-A-8625).
Do these cracks/crazing constitute a failure to meet the spec? (Reference MIL-A-8625, Para 3.13, "...coating shall be...uniform in appearance, free from...breaks, or other defects which will reduce the serviceability of the anodized part..."
What's the difference in a crack VS a craze...depth?
Also, what is visual inspection defined as? Is there any magnification allowed at all or it is just strictly the unaided eye? I couldn't find anything that defines visual inspection...
What is the best way to ensure this coating is truly acceptable or not? The abrasion resistance test MIL-A-8625, Para 3.7.2.2?
Lastly, I had another batch of parts Hard Coat Anodized per MIL-A-8625, Type III with a PTFE seal that did not exhibit this cracking/crazing issue. Could the PTFE prevent or reduce the cracking issue?
Any help is greatly appreciated...especially from Kenvlach.
One part is shown below, approx 0.090" DIA (hopefully).
Do these cracks/crazing constitute a failure to meet the spec? (Reference MIL-A-8625, Para 3.13, "...coating shall be...uniform in appearance, free from...breaks, or other defects which will reduce the serviceability of the anodized part..."
What's the difference in a crack VS a craze...depth?
Also, what is visual inspection defined as? Is there any magnification allowed at all or it is just strictly the unaided eye? I couldn't find anything that defines visual inspection...
What is the best way to ensure this coating is truly acceptable or not? The abrasion resistance test MIL-A-8625, Para 3.7.2.2?
Lastly, I had another batch of parts Hard Coat Anodized per MIL-A-8625, Type III with a PTFE seal that did not exhibit this cracking/crazing issue. Could the PTFE prevent or reduce the cracking issue?
Any help is greatly appreciated...especially from Kenvlach.
One part is shown below, approx 0.090" DIA (hopefully).