Corrosion protection for Maraging steel 1

[lesniowski]

I am looking for corrosion protection for C300 and C250 maraging steel. Must pass high humidity, salt water environment.

 

[CoryPad]

How about zinc phosphate primer plus cathodic electrocoat? Or maybe a multilayer organic -e.g. Dacromet, although there are superior products.

 

[TVP]

What is the operating temperature expected to be? Any potential for wear? CoryPad gave some good candidates if ambient temperature is the predominant environment. I would recommend coatings from Magni instead of Dacromet, but that's mostly personal preference.

Cadmium coatings (vapor deposition instead of electroplating) are used for a variety of aerospace applications. If you can provide some additional details, we can help narrow down the candidates.

 

[lesniowski]

The temperature is 15F to 120F. The coating should be tough enough to be handled and moved by cradles and carts.

 

[TVP]

Depending on the duration of salt spray resistance, it sounds like any of the above would be suitable. Some rough estimates for corrosion protection in a salt spray/fog environment (ASTM test method B 117) are as follows:

1. zinc phosphate + epoxy electrocoat (25 micron thickness) = 500 to 1000 hours. Higher film build will give up to 2000 hours.

2. Magni or Dacromet = 500 to 1000 hours, depending on film build and exact formulation.

3. Cadmium (I meant vacuum deposition not vapor) = 96 hours at a typical thickness of 12 microns.