Saltwater Corrosion

[daparojo]

Dear All,

I am looking at a project in where we will be using EN24 T (BS970 817M40) material in a seawater environment, and where it will be artic conditions. The material will be tested in accordance with the temperatures i.e -10 degrees c.

With that in mind, to protect this material against corrosion, we were initially looking at Cadmium, but open to other kinds of coatings without added a huge thickness to the final product.

Has anyone else had any experience in other coatings for this type of environment?

Many thanks

 

[cap1a79]

For your case, I would recommend to review the options of coating system given in SP-0108 after checking temperature, cost, service category, DFT, etc.,
Reference - NACE SP 0108 - Corrosion Control of Offshore Structures by Protective Coatings

Meanwhile, cadmium coating is ONLY for the limited use nowadays as there are several issues such as liquid metal embrittlement (during fire case), health safety regulations.
Although I have seen the cadmium coating for fastener at high temperature when conventional coating cannot withstand, even for this case, it is being replaced with alternative such as aluminum ceramic coating or PTFE due to the reasons as foresaid above.





Lee SiHyoung,
WorleyParsons Oman Engineering,