A chrome anode would be too brittle and expensive so either graphite or carbon electrodes are used.įor more information on Trivalent chrome, electrophoretic lacquer and electroplating contact Midland Plating & Polishing on 01902 421174 or use the contact form. Unlike nickel and copper plating but similar to electrophoretic lacquer the anode is inert and does not dissolve so the metal deposit comes from the metal salt which is part of the makeup of the solution. The trivalent process has superior “throwing power” in comparison to hexavalent it can cover recessed areas more readily and gives an improved uniformed thickness which avoids excessive plating on outer areas of the component, thus avoiding cracking of the deposit and burning. We also support black trivalent chromate for each color that adds a black tone. Satin chrome is still not compatible but it does produce an aesthetic finish that is down to personal preference, this is also an area that is being investigated. Satin plating: Features a luxurious matte pearskin finish. The early chemistry did not produce a compatible finish to hexavalent chrome but has improved vastly over the last few years and it is difficult to see the difference with the electroplating of bright chrome. The thickness of the Cr3+ deposit is approximately 0.1 – 0.3 microns, in some cases 0.5 microns It was reported may enhance the chromium reduction at the cathode surface, resulting in a bright color deposit, improve plating efficiency and plating range 5. With the high cost trivalent chromates on the market today, HI TEST™ CC-3 provides a user friendly, single component cost effective alternative.Midland Polishing and Plating can offer the electroplating of trivalent chrome known as Cr3+ and hexavalent chrome known as Cr6+īoth chrome processes are part of our aluminium finishing, satin chrome and bright chrome finishes.Ĭhromium plating is used for two reasons, one to prevent the nickel undercoat from tarnishing and two, to produce a hard abrasion resistant surface when the thickness is much higher for engineering purposes that sometimes requires metal polishing. HI TEST™ CC-3 maintains its color and much of its corrosion resistance even after baking for hydrogen embrittlement relief. HI TEST™ CC-3 provides improved corrosion protection over most “high protection” chromates. HI TEST™ CC-3 is a high protection single component liquid trivalent blue-bright chromate for chloride, cyanide and alkaline zinc plated deposits. With the high cost trivalent chromates on the market today, TP-105 offers a user friendly, single component cost effective alternative. the plating layer is whiter, harder and of higher wear resistance. TP-105 is a single component concentrated formulation that is easy to make up and maintain. The coating color is uniform and bright with good covering ability and distribution. Trivalent chromium finish with very uniform and attractive dark colour Environmentally-friendly chromium(VI)-free plating process Very easy and stable. TP-105 deposits a thick chromate film layer that provides improved corrosion resistance and an excellent base for colored dyes. TP-105 is a high protection liquid trivalent blue-bright chromate for chloride, cyanide and alkaline zinc plated deposits. Excellent results are achieved in both rack and barrel plating operations. Jennifer Honselmann, Eric Mankel and Peter Volk. The trivalent process is proven to be a safe replacement for hex chrome, but fundamental knowledge of its composition is required. Hexavalent solutions are still preferred for most heavy-duty applications. Depending on the chrome plating applications, both trivalent and hexavalent solutions are used today. Today, companies use additives to achieve the right color. The first commercially successful decorative trivalent chromium process began in England in 1975 and in the United States in 1976. The testing is done similar to waste water where trivalent and hexavalent chromium are separated. Formation of Trivalent Chromium Passivation Layers. Over time, the recipe used for trivalent chromium plating was refined. The use of the trivalent chromium ion, instead of the hexavalent ion, in solution to deposit chromium has been of interest for many years. That is the reason why the ICP method is suggested. METALLINE188 produces a very consistent blue-bright color with low make up and replenishment costs. Sara, The method you refer to will give a false positive in the presence of iron, cadmium, zinc or several aldehyde compounds. METALLINE 188 is a cost effective liquid trivalent blue-bright chromate for chloride, cyanide and alkaline zinc plated deposits. With chromium plating, the designers of metal components can alter or adjust particular outward qualities including electrical conductivity, texture, and color. Metalline Chemical Corporation manufactures several chromates that provide a wide range of protection over zinc plated deposits. The chemimstry has changed, but the principle of reducing the oxidation of zinc metal is the same. Trivalent Chromates are a more environmentally friendly alternatives to those containing hexavalent chrome.
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