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hard/soft anodize. . .
2

hard/soft anodize. . .

hard/soft anodize. . .

(OP)
what are the differences between the two??
maybe a thicker/thinner difference??
and i see class I class II etc..
any help--thank you

RE: hard/soft anodize. . .

2
There are two standard specifications for anodic oxide coatings on Al: MIL-A-8625F and ASTM B 580 - 79 (1995).  MIL-A-8625F is available for free from the following website: http://astimage.daps.dla.mil/quicksearch/

ASTM B 580 can be purchased through a number of entities:
ASTM at http://www.astm.org
ASM International at http://www.asminternational.org
Global Engineering Documents at http://global.ihs.com

The types or classes fall into two general categories: hardcoat anodizing and not hardcoat anodizing.  Typical anodizing baths use either chromic acid or sulfuric acid as a source of oxygen.  The coating thickness from these baths is usually ~ 1-10 micrometers in thickness.  These coatings can be subsequently sealed, or painted over, etc.

Hardcoat anodizing is typically performed in sulfuric acid baths, resulting in much thicker coatings: ~ 50 micrometers.  This produces much better resistance to wear and abrasion.  Upong sealing, these coatings also provide outstanding corrosion resistance.

There has been at least one other thread on eng-tips regarding anodizing, so use the SEARCH function and find it, as I posted some information there as well.  An excellent website with technical information on the various anodizing processes is http://www.metalast.com, which is the website for Metalast Inc., a commercial coating company in the U.S. that specializes in anodizing.  Another good source of information is Volume 5 of the ASM Handbook, titled Surface Engineering.  The section on Anodizing is about 11 pages.  A good university library should have this book, or you can visit the ASM website that I included earlier for more info.

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