We are currently electroless Ni plating certain steel tubes.Plating thickness being maintained is 8-10 microns.After plating we are testing the parts in water by passing air to check for any leaks.This testing is done as there is a brazing done on the tube and we check the quality of brazing.The tubes are then wiped with a dry cloth and then sent to our customer in USA by sea.
The sea freight takes 4-5 weeks and by the time the parts reach our customer, the parts are rusted. What could be a reason for the rust.Is it insufficient plating thickness or any other reason?
