Methods and Formulas to Determine Internal Deposit Stress in Applied Metallic Coatings
Internal stress exists in electroplated and chemically applied metallic coatings. This paper reviews the test procedures for measuring deposit stress and the formulas used to calculate stress values. Many formulas used require modification to obtain actual internal stress values. Errors in this regard are examined and common mistakes are explained.
Electrodeposition of Ni-Fe-Mo-W Alloys - Part 4
4th-6th Quarterly Report - AESF Research Project #R-117. This NASF-AESF Foundation research project report covers the fourth through sixth quarters of project work (October 2013-June 2014).
A Comparative Study of Gamma-Phase Zinc-Nickel Deposits Electroplated from Various Alkaline and Acid Systems
Sacrificial anodic coatings, specifically zinc deposits, have provided corrosion protection to components and parts across many industries, with an increasing demand in the automotive and industrial sectors. Today, typical sacrificial applications for fasteners, fuel systems, braking systems and drive assemblies require higher corrosion performance from anodic coatings. Electrochemical alloys can be designed to provide the highest corrosion potentials to meet these increased demands.
Chromium-free Etching and Palladium-free Plating of Plastics
Plastics are replacing metals in the manufacture of many parts, and quite often there is a need for metallic coatings on the plastics and other non-conductors. This paper will describe new processes of preparing ABS plastic substrates for subsequent metallization. A process replacing the traditional chromic acid etching step with a room-temperature, environmentally friendly etchant is described. Further, to address the high cost of palladium, a non-precious-metal activator has been developed that can obtain uniform, adherent metallic coatings on plastic substrates.