Summary for 420 stainless steel rust Discussion
420 stainless steel gets rusty fast is the core issue in this thread: Josua Balingcos asks what chemicals or process will keep 420 steel from showing rust for at least two months, since customers are complaining about rusty surfaces on delivered profiles. The answer from McHenry, Illinois is straightforward: the simple fix is to passivate the steel. However, the reply also warns that 420 is on the lower end of stainless grades for corrosion resistance, so even the best passivation cannot guarantee a two-month rust-free period if the parts are exposed to a corrosive environment. In other words, passivation may help, but the actual durability depends heavily on the service conditions and exposure level. The discussion does not offer a specific chemical recipe or a guaranteed process beyond passivation.
Q. What kind of chemicals do we need to use so that the surface of 420 steel won’t be rusty and the preservation will last at least 2months? What kind of process do we need to prevent rusty surface? Becaus rusty surface is one of our biggest problems that we face now due to customer complaints that our profile that they receive is rusty surface. Can you help.me?
Josua Balingcos
new production engineer – Malaysia
A. Josua,
The simple answer is that you need to passivate. The downside is that 420 is towards the lower end of the scale for corrosion resistance of stainless grades, and even with the best possible passivation, how long it will last without starting to rust depends entirely on how much of a corrosive environment it’s in.
Ray Kremer
Stellar Solutions, Inc.
McHenry, Illinois
A. Josua.
First off, your components must be thoroughly cleaned/degreased.I would look for a proprietary corrosion preventative solution that can be dipped/sprayed.
I use a proprietary solution -40-50 % Triethanolamine and 5-10% Diethanolamine.
Regards,
Eric Bogner
– Toronto, Ontario, Canada