Casting - Primer

[Tpintar]

I have a question regarding primer painting.

We are getting a casting/machining order from a company, followed by transport to another location for assembly.

All the non-machined surfaces can be painted for corrosion protection, but I'm not certain what to do about machined surfaces. Should a primer coat be requested for protection until assembly, or can that mess with tolerance values.

Thanks!

 

[TomDOT]

What about simply putting the items in a bag/wrap which also contains a vapor phase corrosion inhibitor (VCI) and/or dehumidification?

 

[Tpintar]

Well the items in question are rather large. something along the lines of cubic meter and over a ton in weight.

They are also stainless, does stainless even require shop priming.

Anyway whaterver is the simplest solution

 

[swall]

I would apply a rust preventitive to the machined areas. Contact someone like Houghon for a recommendation.

 

[TomDOT]

Stainless? You shouldn't need to prime it for atmospheric exposure, unless there is a lot of salt. Is the shop taking care of pickling/passivating after machining?

For the size/weight issue - the US military uses DH and VCIs for full size battle tanks. Painting contractors regularly enclose sections of bridges (say... 20x20x20 meters) for DH and blast containment.

You shouldn't need it for stainless anyway.

 

[swall]

Sorry, Tpintar--I missed the part about the stainless. What grade of stainless?