Entity

Time filter

Source Type

East Independence, Ohio, United States

Vanek D.,Sifco Applied Surface Concepts
Metal Finishing | Year: 2010

Selective plating is a very flexible process, which includes three different processes, including selective (brush) electroplating, selective anodizing, and selective electropolishing and weld cleanup. The plating tools, typically graphite, are wrapped with an absorbent material that both holds and distributes the solutions uniformly over the work area. Solution is supplied to the work area by either dipping the tool into a container, or by pumping it through the tool and recirculating. The plating tool is then moved over the work area. Selective plating equipment includes power packs, preparatory and plating solutions, plating tools, anode covers and auxiliary equipment. The electrolytes used for selective anodizing are available in water-based solutions, or may be in the form of anodizing gels. Selective plating processes are used approximately 50% of the time because they offer a superior alternative to tank finishing processes and 50% of the time because they are better repair methods for worn, mismachined or damaged parts. Source


Zhong Z.,Sifco Applied Surface Concepts | Clouser S.J.,Sifco Applied Surface Concepts
Surface and Coatings Technology | Year: 2014

Hard coating can improve the surface properties of a material beyond the capability of the substrate. For a long time, coatings such as hard nickel, hard chromium, hard alloys and hard composites have been developed for engineering applications due to the improved wear resistance. A newly-developed nickel-tungsten brush plating process has the potential as an alternative of electroplating of hard chromium for engineering application.The nickel-tungsten solution is based on the ammoniacal citrate bath, which can be conveniently brush plated just as brush plating of other metals or alloys. On the other side, hard chromium cannot be brush plated due to the exposure of hazardous hexavalent chromium exceeding the Occupational Safety and Health Administration (OSHA) limits.The nickel-tungsten alloy coating has been developed for engineering application. It is of nanocrystalline structure (~. 2. nm crystallite size) and demonstrates excellent hardness and wear resistance. The coating is 60% nickel, 40% tungsten by weight. Due to high tungsten content in the alloy, it is thermally stable. Moderately elevated temperatures (200-500. °C) do not cause grain size growth and softening as the case of most other hard coatings (such as hard chromium, nickel phosphorus). Actually, the nickel-tungsten alloy coating can be further hardened by exposure to high temperature of 200-500. °C for a short period of time. Beyond the hardness and wear properties, the coating has been further characterized by XRD, electronic and optical microscopy, hydrogen embrittlement, salt spray corrosion, tribology, axial fatigue, and other testing. © 2013 Elsevier B.V. Source


Xiao H.,Sifco Applied Surface Concepts | Clouser S.,Sifco Applied Surface Concepts
National Association for Surface Finishing Annual Conference and Trade Show 2010, SUR/FIN 2010 | Year: 2010

Metal matrix composite coatings can improve the surface properties of a material beyond the capability of the substrate, the composite material or the metal alone. The high temperature performance of a cobalt metal - chromium carbide particle composite coating, which can be applied by several methods, provides protection against oxidation and wear. This work investigates the application of a Co-Cr3C2 metal matrix composite by brush plating. The Cr3C2 particles were highly dispersed and suspended in the cobalt sulfate electrolyte through effective agitation. The particles were electrophoretically deposited along with cathodic deposition of cobalt. The distribution of the Cr3C2 particles throughout the composite coating was observed to be uniform by x-ray fluorescence and by optical and scanning electron microscopy. The electrodeposited composite coating showed improved characteristics including superior hardness and wear resistance. The Co-Cr3C2 coating demonstrated oxidation protection and an increase in hardness upon exposure to temperature up to 815°C. The abrasive wear resistance measured with a Taber abraser also improved after a high temperature exposure. The adhesion of the coating to the substrates was strong in part due to a nickel interlayer used to enhance the bond between the substrate and the coating. The residual stress of the Co-Cr3C2 composite coating on a steel substrate was found to be much smaller than that of a cobalt metal coating. This work demonstrates that brush plating can be used to apply a high performance coating to a select area on a substrate. Copyright © (2010) by the National Association for Surface Finishing. Source


Burfield R.D.,Sifco Applied Surface Concepts | Saleker R.,Sifco Applied Surface Concepts
Metal Finishing | Year: 2011

Plastics molders, operating both captive and job shops, are frequently plagued with downtime due to repairs that must be made on damaged or worn mold components. Typical repairs include damaged cavities, worn gate areas, and parting lines that cause flashing of molded parts. If a mold has a lot of corrosion, scratches and other small surface flaws that result in a poor finish on the molded part, the temptation may be to remove the tooling and send it out for tank electroplating. However, selective plating can take care of these flaws in place, without extensive masking, and is significantly faster than tank electroplating. As wear occurs and pin and bushing dimensions deviate from accepted tolerances, it becomes necessary to discard and replace core pins and core bushings. With the accurately controlled selective plating process, these parts can be quickly plated back to size and put in service, often without finish machining. Source


Xiao H.,Sifco Applied Surface Concepts | Clouser S.,Sifco Applied Surface Concepts
Plating and Surface Finishing | Year: 2010

Metal matrix composite coatings can improve the surface properties of a material beyond the capability of the substrate, the composite material or the metal alone. The high temperature performance of a cobalt metal - chromium carbide particle composite coating, which can be applied by several methods, provides protection against oxidation and wear. This work investigates the application of a Co-Cr 3C 3 metal matrix composite by brush plating. The Cr 3C 3 particles were highly dispersed and suspended in the cobalt sulfate electrolyte through effective agitation. The particles were electrophoretically deposited along with cathodic deposition of cobalt. The distribution of the Cr 3C 3 particles throughout the composite coating was observed to be uniform by x-ray fluorescence and by optical and scanning electron microscopy. The electrodeposited composite coating showed improved characteristics including superior hardness and wear resistance. The Co-Cr 3 C 3 coating demonstrated oxidation protection and an increase in hardness upon exposure to temperatures up to 815°C. The abrasive wear resistance measured with a Taber abraser also improved after a high temperature exposure. The adhesion of the coating to the substrates was strong in part due to a nickel inter- layer used to enhance the bond between the substrate and the coating. The residual stress of the Co-Cr 3C 3 composite coating on a steel substrate was found to be much smaller than that of a cobalt metal coating. This work demonstrates that brush plating can be used to apply a high performance coating to a select area on a substrate. Source

Discover hidden collaborations