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Friction coating used to avoid vibration

February 14, 2008

1. We use number of bolts for fastening the various parts of automobiles, these parts are dipped in chemicals. I want to know which is the perfect coating which avoids vibration in automobiles.Basically what I meant is which is the best friction coating used to avoid vibration?
2. How does it work? (With technical data)

Fenny Thomas
Engineer - Kandiveli, Mumbai

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Molydenum Disulfide coating.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

February 20, 2008

MoS2 is an anti friction material. I suspect that he is looking for something like the common material "Loctite" in the USA There are many other brands and each has various levels of locking the bolt or stud into metal. These levels vary from a little bit sticky or gummy to "you might break the bolt before it comes out."

James Watts
- Navarre, Florida
February 21, 2008

What the technical data related to coating of molydenum Disulfide coating? Is it something like Loctite coating or is it like normal coatings like zinc or phosphate coatings given to the threaded fasteners?

Fenny Thomas
- Mumbai
February 25, 2008

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I think this discussion is showing us that people don't understand what you want, Fenny. Please confirm that you are looking for some kind of loctite-like coating to prevent bolts from loosening. Thanks.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 25, 2008

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First of two simultaneous responses --

MoS2 is ideally applied over a grit blasted surface that has a modified zinc phosphate coating. It is normally sprayed on and then baked. While it is not graphite, it is somewhat similar to graphite in it's use. It is referred to as a dry film lubricant.

James Watts
- Navarre, Florida
February 25, 2008

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Second of two simultaneous responses -- February 25, 2008

Loctite is a polymer adhesive used to avoid vibrational loosening(This is not what I want).
Threaded fasteners comes in different types of coatings like zinc, phosphate, xylan, dacromat, etc. which helps in corrosion resistant, lubricity, decorative.
SO I what to know, is there any coating that helps in resisting vibration?

Fenny
- Mumbai

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You say you do not need something to avoid vibrational loosening, but you do need something to resist vibration. Fenny. I think this wording is what continues to cause us difficulty. We simply don't know what you mean by "resisting vibration". Do you expect a fastener to act like a spring and shock absorber, so you won't feel a pothole when your car hits it, or won't feel the engine running? Or have you experienced a coating actually coming off from a fastener like a dog drying itself? There are strict adhesion standards for all coatings and no coating should shake off.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 25, 2008