Hard Chrome

Polished Chrome Roll	Hard chrome deposits are widely used to provide a hard, abrasion resistant surface, and also for building up worn or undersize parts. Phoenix Electroplating Ltd are specialises in Hard chrome deposition on rollers, cylinders and shafts. These items are used in many kinds of machines; paper making and printing machines, embossed cylinders for wallpaper and other materials, rollers used in the manufacture of plastic sheet and film, shafts used in hydraulic equipment, and much more. We provide two types of Hard Chrome...
Anilox Roll (enlarged section)	Standard Hard Chrome A high quality hard coating (hardness appox. 950-1050 Vickers or 68 Rockwell C) which can be applied in a range of deposit thicknesses to suit your requirements. Some typical deposits may be used as follows... 7.5 microns (0.0003") to 25 microns (0.001") Flash coatings to engraved analox rollers, embossed cylinders and coatings to other rollers and shafts that are not subject to too much abrasion, and for slight corrosion protection. 25 microns (0.001") to 76 microns (0.003") Thicker flash coatings for better abrasion properties, and for slightly better corrosion protection. Over 76 microns (0.003") Heavy deposits which usually require grinding and or polishing after plating. Used when a good surface finish is required, for such uses as plastic and film manufacture, calendar rollers in paper and board production.
	Microcracked Hard Chrome (Bright) This offers a number advantages over the standard Hard Chrome... Harder and more wear resistant (hardness appox. 1050-1150 Vickers or 70 Rockwell C). Offers better corrosion protection. Brighter finish. These extra qualities make this chrome ideally suited for use with hydraulic rams which may be operating in dirty environments, if dirt is liable to lodge in seals, less harm may be done to the ram. For wet or salt water environments, an under coat of nickel plating provides a corrosion resistant layer, that extends the working life of the ram considerably. This chrome is also well suited to any application that standard chrome is also used.
Roll before machining & after chrome	Before & After Treatment of Hard Chrome Other operations may be required, prior to, and after chrome plating... Pre-machineing to supplied dimensions or surface finish tolerances. Finish machining and polishing to supplied dimensions or surface finish tolerances. Nickel plating for a corrosion protective layer. Shot/grit blast before or after plating to produce a textured/matt finish or for de-embrittleing the material prior to chrome plating. Heat treating before/after plating for de-embrittling or degassing to relieve stresses in the material or remove trapped gasses which may cause problems when the roll is used in plastic and film manufacturing proccesses. Note on Hard Chrome It is a common misconception that chrome plating provides corrosion protection. This is not the case, only slight protection is given. Hard Chrome is porous at the microscopic level, which can let moisture and chemicals through to attack the base material. If the item is to be used in a damp environment, or where water based inks are used on printing machines, a layer of Nickel plating is required, prior to hard chrome plating.

Maintained by Michael Oates
Last updated 2 June, 2009