Salt mist corrosion test on weld through primer and rust converters week 1
When we run a salt mist test I always include a sample of mild steel in with the test so that I can show the customer how tough the test is and how well their product has withstood the testing process. The following photographs show the 4 samples before they were put inside the salt mist chamber. To make sure conditions were the same all 4 pieces of mild steel were cut from the same sheet, are approximately the same size and were all cleaned back to shiny metal using an angle grinder so that any grease, coating or contamination had been removed. Then each piece of metal was subjected to the particular coating.
Control standard (no coatings just cleaned with angle grinder)
This piece was just cut to size and then cleaned with an angle grinder.
Sample coated with U-Pol Weld through primer
This piece was cut to size and then cleaned with an angle grinder before being given one coat of U-Pol weld through primer. This is a readily available primer and I bought mine at Halfords and sprays on nice and easily although you have to be careful not to put too much on as it does tend to run (not a problem is areas you cannot see) but would need to be flattened back if required to be painted with top coat.
Sample Coated with Bilt Hamber etchweld primer
This piece was cut to size and then cleaned with an angle grinder before being given one coat of Bilt Hamber etchweld weld through primer. This primer I bought mine from the Bilt Hamber website and sprays on nice and easily and does not run as easily as the U-Pol product.
Sample coated with Hydrate 80 (rust converter)
This piece was cut to size and then cleaned with an angle grinder before being given one coat of Bilt Hamber hydrate 80 which is a rust converter but unlike some other products which have to be washed off and then primed this one reacts to form an inert surface that can be painted over. The instructions say that it can be left like this but recommends painting but I thought it would be an good idea to see how good it is without being painted (as painting should make it even easier). This product is painted on and a nice light blue colour but as it dries it takes on this mottled effect shown in the photo above. It only had one coat and I am not sure how well the steel is coated as there the product runs a bit and it looks like it has left some areas uncoated but only time will tell.
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