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Sanford Hardcoat Process


This question is about Aluminum finishing. Can anyone provide more information on SANFORD HARDCOATING process? Is this a proven answer for hardcoating high Silicon alloy?

Thanks in advance.

Ganesh Natarajan

Surface Treatment & Finishing of Aluminium and Its Alloys
Wernick, Pinner & Sheasby
from Abe Books


The 'Sanford Process' is indeed a proprietary hardcoat process (licensable from Sanford Process Corp., Div. of Katahdin Industries, Natick, Mass., U.S.A.) I don't know whether or not it is good for high silicon alloys, but contact the licensor for general information.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


[As an alternative to the Sanford process] my shop we have 2 different systems for hard anodizing:
1) Mod Martin
The IMPERVX lets us coat difficult alloys like you mentioned.

David A. Kraft
- Long Island City, New York


Luke Engineering has been hardcoating high silicon/copper aluminum die-castings for over twenty years with the unique process LUKONDC. Hardcoating thicknesses of up to 75 um are possible, however, in production the "normal" thickness range is 20 to 50 um.
We will be glad to hardcoat prototypes for evaluation, free of charge.

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
supporting advertiser
Wadsworth, Ohio

luke engineering banner

August 24, 2011

We are using the Sanford process and are having issues. Namely, we're failing Taber tests on 6061 with this process.

We *did* have temperature uniformity issues which are gone now.

Chemistry (sulfuric acid component) is ok. We don't have an analysis for the Sanford additive.

Sanford has so far been silent.
I'd like to fix our process then pursue a process more transparent.

Joe Zanter
- Loves Park, Illinois

August 24, 2011

Hi, Joe.

I visited Sanford so long ago that I barely remember it, but to my knowledge the Sanford Process is "Type 2-1/2" anodizing -- a simulated hard anodizing that that does nor require the electrolyte to be 28° F, but about halfway from there to ambient temperature. We don't compare brands here, but as you can see from the previous postings, there are proprietary alternatives.

All proprietary processes will lack some degree of transparency, of course, or they wouldn't be proprietary, but if you want a transparent process and are will to operate at 28° F., you can consider type 3 anodizing. Good luck.


Ted Mooney,
Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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