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Thread 267/58

Which coating to use on motor shafts?

At Present I'm designing a motor shaft which works in a moist environment. Cost is a big factor so what are the types of steel and coating I can go for to avoid corrosion at minimum cost.

Sanjeev
Design Engineer - Hyderabad, Andhra Pradesh, India
2004
publicly reply to Sanjeev

Motor shafts are sometimes cold rolled medium carbon steel but are often alloy steel for strength. It is not common to paint or electroplate them because tolerances are usually close. It is possible to black oxide and oil them, which would afford good looks and very moderate corrosion resistance without affecting the tolerancing.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003
publicly reply to Ted Mooney

An excellent sacrificial paint system for steels would be ones that contains aluminium.

John Hetherington
Aerospace - Canada
2004
publicly reply to John Hetherington

Normally the motor shafts are zinc phosphated. But any idea how many hours of salt spray it should withstand? What is the notmal specification for phosphated motor shaft for salt spray test.

Prasanna
- Aurangabad
2004
publicly reply to Prasanna

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