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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing 1989-2025
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Tire Bead wire Adhesion, Plating, Composition
Q. We do Acid dip copper plating on 0.965 mm wire which contains small amount of tin . The coating of wire typically contains 0.45 g/kg of copper coating in which % tin is 2 .This wire is used in Tire Industry which goes in bead of tyre which take maximum load of tyre as it fits onto wheel rim. The adhesion of wire with rubber is an important properties. I like to have information adhesion of this Tire bead wire as follows. What quality of coating is req. to get good rubber adhesion? What is the effect of plating line process parameters on coating quality?
Dinesh GudadheIron & Steel - MUMBAI, MAHARASTRA, India
2003
A. Mr Gudadhe
Do you deposit copper by the passage of Current. Or do you dip the steel and achieve immersion copper deposits without passage of current?
If you do what is called liquoring of steel wire in a copper sulphate
⇦ this on
eBay or
Amazon [affil links] solution the deposit will tend to be loosely adherent to the base and usually causes loosely adherent deposits of copper that flake readily or peel off with the rubber.
Copper plating with current on clean surfaces is the right solution.
I am aware the industry has been using the liquoring method as a cheaper substitute for plated copper.
In response to the last part of your question I suggest you appoint a professional Plating consultant to help you set your parameters right.
Asif Nurie [deceased] [deceased]
- New Delhi, India
With deep sadness we acknowledge the passing of Asif on Jan 24, 2016
A. The copper coating is simply a immersion process and no current is passed. We do peel test also and as such every wire is tested for complete property test including coating. Through research it was found that the sulfur of rubber combines with copper which gives good bond with rubber. I would like to have information on the quality of coating and its effect on rubber adhesion.
Dinesh Gudadhesteel - Mumbai, India
Q. Dear Sir, Please through some light on following Points:
Point No. 1: What is the role of Tin in Bead wire Bronze plating system? Generally For getting better adhesion with rubber, Industry trend is to keep Tin content in Bronze composition is maximum 3 %. I would like to know what is the effect if we increase the Tin content from 3 % or we reduce it below 1 %.
Point No.2: Which type of Bead wire will provide good adhesion and also cost effective, if we have to choose from Brass coated and Bronze coated bead wire and why?
With Best Regards,
Scientist - Kankroli, Rajasthan, India
2003
A. Dear Sir,
The Stannous Sulphate is added to work as a binder. Increasing above 2% will reduce the malleability of the coating.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
Q. Although we achieve the costumer specifications for coating (bronze amount and Sn% specified on the specs) we receive bad adhesion results even in the same Lot (the wires produced on the same line, at the same doff). Checking the standard wires (the wires to make sure if the compound is satisfactory) there is no worsening as we have in normal production wires' adhesion results.
I cannot be sure whether this is coming from the process(process conditions are same in the wires with high adhesion and the wires with low adhesion) or from the compound(the compound doesn't seem to be different than the latest one regarding the standard wires' adhesion results) or the testing (the operator; the press; Instron are all the same in high and low adhesion wires)
Thanks in advance.
engineer - Turkey
2007
A. Dear Mr. Inseli
Adhesion of bead wire is Unique, but the philosophy of Adhesion is where the rubber reacts with the bronze plating on wire surface.
The force of the adhesion depends on two condition:
1. First condition is mechanism of rubber bond to the coating.
If any substances between coating and rubber the force becoming lost in force. for this reason you must check from plating process and after plating process condition until the adhesion test.
2. Second condition is coating condition with the wire.
If coating condition is bad even the reaction of coating + Rubber is good, the force will be lost.
For this reason you must check before plating and plating process condition.
bead wire tech. - Bogor , West java. Indonesia
May 14, 2010
An essay about bronzed bead wire
Q. I want to have complete information and formulas about the process of bronzing bead wire, formulas about this process because of my new job. Please help me.
thank you
metallurgy engineer - Qazvin, Iran
November 22, 2010
A. Hi, Ehsan.
I assume you're speaking of the wire used in tire manufacturing?
Besides what you can read on this page, I think if you google with a variety of terms you will find general process information, like how many steps there are and what those steps are, from the suppliers of these bead wire plating lines.
Unfortunately, asking for "complete information" in a public forum is sort of an oxymoron because people cannot give you "complete information" about any subject within the time and space commensurate to a public forum :-)
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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