![]() ![]() The vibration generated by the wheels revolving on the rough floor of the plant caused fretting corrosion in spots along the lines of contact between workpieces. Failure to do so, for example, has caused rows of pits on plated hydraulic shafts that were stacked on iron-wheel dollies for in-plant transfer. Nickel or tin plate rotating steel sleeves or collector rings.īefore plating, the workpiece must be handled with care to prevent contact with other surfaces.Clean all the internal surfaces thoroughly or seal them tightly so they cannot contact the plating solution.Clean and etch the work in separate tanks (not in the plating tank).Lacquer the ends or edges of adhesive stop-off tapes to avoid dissolution of the latex adhesive in solution.Keep the racking areas, benches, tote pans, cradles, etc., clean.Do not buff or polish in the plating area.Clean the work thoroughly to remove ail grease, dirt and polishing compound before plating.Keep the work surface wet as it enters the solution.Skim the tank and keep the freeboard area clean.Please contact our application engineers to discuss the feasibility of applying Hard Chrome to other metals such as aluminum. Hard Chrome can be applied to all types of stainless steel alloys, most ferrous metals, and some nonferrous metals including copper and brass. The HVOF sprayed coatings can offer superior wear and corrosion protection. One option is to replace hard chrome with high velocity oxy-fuel (HVOF) sprayed coatings of cermet materials such as WC/Co (Tungsten Carbide/Cobalt). This has led to many users of chrome plating seeking alternative coating methods. However, there are environmental concerns associated with disposal of the plating solution. These are designed to retain lubricant, for sliding and bearing type applications.Ĭhrome plating is used for wear and corrosion resistance in addition to its tribological (low friction) characteristics. Porous chrome plating is developed by etching electrodeposited chromium. The formation of micro-porous chromium is achieved by a specialised plating method involving the use of inert suspended particles. Micro-cracked chromium has a Vickers hardness of 800-1000 kg/mm2, while crack-free chromium has Vickers hardness between 425-700 kg/mm2. It is essential that the micro-cracked and porous coatings have a minimum thickness between 80-120µm in order to confer adequate corrosion resistance. Various types of hard chrome include micro-cracked chromium, micro-porous chromium, porous chromium and crack free chromium. Thickness of hard chrome plating ranges from 2 to 250µm. Hard chrome plating is an electroplating process in which chromium is deposited from a chromic acid solution. Hard Chrome Plating ( Industrial hard Chrome ) : Hard chrome plating is commonly applied to various types of steel and is almost always thicker than decorative chrome plating. ![]() Hard chrome plating, while it can improve the corrosion resistance of the material to which it is applied, is primarily used to increase the wear resistance of certain components. This type is typically used in industrial settings where aesthetic appeal is not the primary concern. Decorative chrome plating usually has a total thickness under 0.001 inch. The chromium layer helps increase the corrosion resistance of the material and also improve the resistance to scratching and wear. Once the nickel layer has been deposited, a chromium layer is added on top of it. The nickel gives the surface of the object its shine and its polished look. This type employs a layer of nickel and a layer of chromium. There are two main types of chrome plating: Sometimes the component enters the chrome plating vat while electrically live. Ferric chloride is also popular for the etching of nimonic alloys. ![]() Different substrates need different etching solutions, such as hydrochloric, hydrofluoric, and sulfuric acids. There are many variations to this process, depending on the type of substrate being plated.Application of plating current for the required time to attain the desired thickness.Placement into the chrome plating vat, where it is allowed to warm to solution temperature.Various pretreatments depending on the substrate.Manual cleaning to remove all residual traces of dirt and surface impurities.Chrome plating a component typically includes these stages: ![]()
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