Commercially produced fe 18cr 3al 0 1rem alloy strips with a thickness of 0 3mm were used as a substrate for aluminum coating. The normal standard used in powder thickness measurement is the mil where 1 mil is equal to a thousandth of an inch 1 1000.
Determining powder coating thickness and tolerance november 8 2016.
Aluminium powder coating thickness. Substrate type thickness range part shape and economics determine the best method to be employed. The standard film thickness for a standard powder coating for optimum mechanicals is between 60 and 80 microns 2 3 mils. The standard film thickness for a standard powder coating for optimum mechanicals is between 60 and 80 microns 2 3 mils.
Coating thickness for architectural use can be specified as either class 1 0 7 mils or class 2 0 4 mils per aluminum association daf 45 but often there is no specification. For the regular class 1 class 2 powders a minimum average of 60µm over the surface is required for an applicator to be approved. The qualicoat specification can be indicative of a minimum thickness for powder coating on architectural aluminium substrates.
The cheapest thing is then installed and in a few short years the finish is pitted stained and eroded. So if the manufacturer s specified thickness is 2 to 5 mils the final cured thickness of the powder should be between 0 002 and 0 005 of an inch. Professionally applied powder finishes use electrostatic technology and uniformly heated ovens to armour parts.
In order to form that protective barrier the equipment needs to be configured so that adequate surface coverage is assured for under coverage problems will starve. Thickness of al layers was varied to obtain 7 to 13 al containing alloys. Thickness measurements of powder can be taken before and after curing.
After al coating the strips were cold rolled to 0 03mm to 0 1mm thick and then heat treated or diffusion annealed in vacuum at 1173k for.