Metal Finishing Magazine June 2008: Chromium-Free Corrosion Solutions Journal of Applied Surface Finishing 2007: Chromium-Free Conversion Coatings for Zinc and its Alloys Plating and Surface Finishing Magazine October 2007: Unexpected Results from Corrosion Testing of Trivalent Passivates Summary of Torque Tension Data: Zinc Yellow Chromate vs. Zinc Elisha EMC The objective of this testing was to obtain a torque tension comparison between Wilson Garner M10 bolts coated with zinc and yellow chromate and zinc and Elisha’s Mineral Coating (EMC®). Torque tension is used to predict repeatable clamp force and is a critical characteristic for many fasteners. The data showed that there was less friction on the bolts coated with the Elisha EMC® than the ones coated with yellow chromate. Points of Difference: Electrolytic Mineral Coat vs. Chromate Conversion Coating EMC vs. Cadmium Zero Chrome Electrolytic Surface Treatment for Metallic Surfaces - Part I Elisha Technologies Co. LLC announces its latest achievement in surface engineering know as Cathodic Mineralization. Cathodic mineralization is a proprietary electrolytic process, similar to electro-galvanization, that is operated by immersing a metallic (or an electrically conductive) component within an electrolyte containing water and a silicate solution. The component interacts or reacts with the electrolyte to form a "mineral-like" layer. The mineral layer is so thin that it will not affect the dimensions of tolerance sensitive parts. The mineral layer can replace chromating for electro or mechanical plated zinc and zinc alloys. A Cathodically-Deposited Mineral Coating for Replacement of Cr (VI) and Cr (III) Treatments of Zinc Since its inception, Elisha Technologies Co. LLC has actively pursued the development of mineralization technology. Mineralization technology is the process of forming a thin mineral film on the surface of metals used as protection, decoration, insulation, and other untapped applications. Elisha Technologies has successfully developed a corrosion resistant coating process based on silicate chemistry known as Cathodic Mineralization (CM) and has coined the term Electrolytic Mineral Coat (Elisha EMC®) to describe the new surface. Development and Commercializaton of Non-Chrome Electrolytic Surface Treatment for Metallic Surfaces Elisha Technologies Co. LLC has discovered ways to grow high performance thin silicate-based mineral films on metallic or metallic coated substrates at low temperature and ambient pressures in conventional electrolytic baths. The work to date has been predominately on zinc and its alloys. The subject process, developed over the last several years, converts naturally passivating oxide films into unique complex oxides. Protection and enhanced surface characteristics are afforded without the use of hexavalent or trivalent chromates. Modification and Characterization of Mineralization Surface for Corrosion Protection Protective coating for metals and alloys that are both thin and continuous remains an area of major concern. The following examines the production and characterization of such a novel coating that is advantageous because it employs both a readily available and inexpensive additive, silicates, and supply of metallic cations already present on the pre-coat surface. The process involves formation of a thin metal silicate layer that differs from the usual silica coat in that it incorporates a natural metal top layer in the silicate layer and can be as thin as several hundred angstroms and still imparts corrosion inhibiting behavior. Wheel Stud Scoping Test with Elisha Systems Aluminum wheel hubs were sectioned and then wheel bolt and nuts were installed into the hubs. The assemblies were placed into GM 9540P cyclic accelerated corrosion testing for 100 cycles. Results are compared to the industry standard process. Torque breakaway was tested at 40, 80, and 100 cycles. Corrosion Comparison of Plated and Topcoating Systems for Nylon Insert Nut Applications The Elisha EMC® system offers superior deformation tolerance. This paper shows results of testing on nylon insert nuts. After all other processing is complete, these nuts have a lip rolled over to hold the nylon in place. The Elisha system along with several tri-chrome systems are deformed then tested in ASTM B117 for 1008 hours or GM 9540P for 60 cycles. The pictures show it all. Elisha Tech & Alcoa - Evaluation of Cadmium Alternatives - Phase I Paper Elisha Tech & Alcoa - Evaluation of Cadmium Alternatives - Phase I Report Elisha Tech & Alcoa - Evaluation of Cadmium Alternatives - Phase II & III Paper Elisha Tech & Alcoa - Evaluation of Cadmium Alternatives - Phase II & III Report Elisha Tech & Alcoa - Evaluation of Cadmium Alternatives - Phase IV & V Paper The U.S. Air Force commissioned Lockheed and Alcoa Fastener Systems to find a cadmium replacement for fasteners. In a contest with several other systems, the Elisha system came out on top. In this paper the Elisha system is identified generically as "Surface Mineralized Zinc Nickel". Additional testing has been performed. Surface Mineralization as an Alternative to Cadmium Plating and Hexavalent Treatment for Corrosion Protection Test samples were taken to 180 cycles in GM 9540P testing. Over 24 different sample groups were tested. This paper reports on the Elisha systems and several competing systems. The results are shown compared to Type I and Type II Cadmium controls.

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