Black Rhodium Plating Views
Black rhodium gives a grey-black finish and is an interesting alternative to normal rhodium plating. There are two options available for black rhodium plating; selective plating for when you would like selective parts, not all, of your item black rhodium plated or a even coating for the whole item. We often use selective black rhodium plating to highlight black stone areas within a set ring piece.
I am a designer and a jeweler in my country. I'm very much interested in learning new techniques in manufacturing jewelleries so as to upgrade and enhance my designs and finishings in the jewelleries i do for my clients. I would like to learn the proper process of doing black gold Rhodium plating onto K18 white and yellow gold metal. I have tried many times to plate in black gold rhodium but the desired color does not come out to be what i have expected.The finish is not in a matt black finish like how the other jewelleries i see in the trade fairs and in magazines. And also I'm very much interested in learning the technique that Phillip Charriol uses to do with his cable wire watch bungles and bracelets they used in their jewelleries. The finish is a very matt black finish. Thank you and hoping that your company will be able to assist me in the proper process in doing this black gold metal platings and also in enamelling finishings.
The inventors have become aware of following fact after investigations for developing a bath composition for plating ( plating bath or bath hereinafter) which provides a plating suitable for ornamental articles, particularly glasses, watches, accessories, cosmetics or dinner wares: rhodium-plating with black or blue color and mirror-like gloss is obtainable through a normal plating manner in an acid rhodium-plating bath comprising an additive consisting of at least one selected from the group consisting of organocarboxylic acids, aromatic sulfonic acids or salts of these, amine, gelatin, butynediol and hypophosphite, the resultant rhodium-plating providing good adhesion and good corrosion or erosion resistance. Based on such finding, the inventors have completed the present invention.
The color of the rhodium-plated coating or film relates to the thickness thereof, wherein a thinner coating will produce blue color while a thicker coating black color. Provided that benzoic acid is used as organocarboxylic acid, the plating of the thickness less than 0.05 micron produces the blue color, whereas the thickness of 0.1 micron or more produces the black color, and the thickness between 0.05 and 0.1 micron will produce bluish black color. The thickness of 5 microns shows still the black color. Other organocarboxylic acid develops also the similar results in the color as well as the other additives aforementioned.
Black Rhodium Plating Images
