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Alternative to a proprietary coating

2007

Please can you advise if there is an alternative to this coating which looks to be only available in Australia

Main functions: Lubrication under medium to very high loads
Corrosion resistance up to 240 ù 500 hours **
Coefficient of friction: 0.1 ù 0.05 (coefficient of friction reduces under load)
Appearance: Dull gray ù black, slightly oily to touch
Film thickness: 15 ù 25 microns**
Permissible substrates: All steels (including stainless), anodized, aluminium
Operating temperature: 130 °C continuous, 150 °C intermittent
Flexibility: Fair
Chemical Resistance: Poor resistance to Alkalis, Good resistance to Acids **

RECOMMENDED AREAS OF APPLICATION:

• Fasteners (general industrial, mining, construction and automotive, particularly trilobular bolts)
• Automotive clips, springs & brackets
• Chains requiring lubrication without the use of liquid lubricants
• Load bearing components needing dry lubrication
• Gears, sprockets, hinge pins and couplings>

David Jeffers
Metal Products Stamping - Thailand

Hello, David.

Why is it important to you that the coating be grey-black, limited to 130 °C, only fair in flexibility, and offer poor resistance to alkali?  :-)

Seriously, here in the USA we've had a lot of experience in finding substitutes for cadmium and chrome plating, and we've learned that you can find substitutes (things that offer the properties you actually need in a given instance), but you can't find across the board equivalents because no two things can have identical properties or they'd be the same thing. So what I'm suggesting is that instead of using a promo sheet from that particular product, you need to determine which of those properties are actually essential to you. Things like poor resistance to alkalis is obviously not important, but is good resistance to acid important for example?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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Hi Ted

Many thanks for the reply.

Well cannot answer all that you have suggested, however the component is a threaded bar and part of an assembly. The assembly is part Zinc plated and of course the Molybond on the thread.

The molybond offers a lubrication as part of the substrate I guess and so is better than the zinc plating which came away after several unscrewing and fastening trials. The part being a spare wheel carrier used for passenger cars.

So we are looking for an alternative here in Thailand.

David Jeffers
- Thailand
2007

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It being true that a molybond lubricant is a good idea, properly applied zinc plating would not come off, David. You don't change to a more complicated process because the simple one isn't being done right :-)

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007