Dear All,
New to this very informative forum, and wishing for some advice.
We have several hundred pressure vessels sucessfully used for transportation of various refrigerants over many years. The carbon steel is coated with 85/15 Zn/Al, using a hot flame technique.
Our vessel supplier changed to a plasma application process, and after 1 yr of service we have found 4 containers with an internal bubbling of the coating (please see the photo's).
We have never seen this problem before.
We will thoroughly investigate this problem, but was interested to know is this is more likely to be due to an application problem (the change to plasma), or a corrosive contaminant in the refridgerant we have not experienced before?
Thanks for you help.