CHROME OR RHODIUM PLATING ALUMINUM

WE WANT TO PLATE AN ALUMINUM PRODUCT USED IN THE MARINE INDUSTRY . WE WANT IT TO BE PROTECTED AS GOOD AS POSSIBLE .WITH A COST FACTOR, WHAT IS THE BEST WAY TO PLATE ALUMINUM TO LAST IN THE ELEMENTS, OF SALT WATER.

Hi Bob,
It would be much more expensive to plate Rh, especially with the thickness required for salt water applications. The Rh deposit would be too stressful. I have seen good results with a microcracked hard chrome (bright), with a sulphamate Ni underplate. Good Luck!

Forget Rhodium. It cracks and then the seawater will undercut the deposit and lift it right off. In seawater, nothing beats Cadmium. I heard that Zinc-Nickel alloy was supposed to replace Cad, but I don't know how far that's gotten.