Coating of steel in a CP ennironment
Coating of steel in a CP ennironment
(OP)
Hi All,
I was wondering what the opinion was on subsea coatings for structural steel e.g S275/S355.
The company I work for has used many different coating such as, thermally sprayed aluminium, epoxy coatings, diffused nickel plate. The thing is most of these are not suitable for mechanical moving components such as pins etc where a good surface finish is required. So I was wondering what other people use for such situations for long term subsea service?
I was wondering what the opinion was on subsea coatings for structural steel e.g S275/S355.
The company I work for has used many different coating such as, thermally sprayed aluminium, epoxy coatings, diffused nickel plate. The thing is most of these are not suitable for mechanical moving components such as pins etc where a good surface finish is required. So I was wondering what other people use for such situations for long term subsea service?





RE: Coating of steel in a CP ennironment
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coating of steel in a CP ennironment
RE: Coating of steel in a CP ennironment
1. Corrosion protection
2. To reduce the number of sacrificial anodes
3. To facilitate a more uniform distribution of CP current
Since 'pins' will be relatively small, in the scheme of things, there is, generally, no sharp intake of breath when they are selected in corrosion resistant alloys that require neither coating, nor CP, for corrosion protection. The alloy could be either solid, or weld deposited on a substrate of cheaper, less corrosion resistant material. It may also be that the 'pins' require hard facing to control wear.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coating of steel in a CP ennironment
RE: Coating of steel in a CP ennironment