Most defects in various hard chromium deposits arise from defects in the basis metal. These defects may be in the original metal surface or may be caused by preplate finishing. Homogeneous hard chromium deposits can be produced only by eliminating these defects. The final segment of this article describes visual and provocative methods of detecting defects. Also discussed are prevention techniques and repair operations.
Crack Formation during Electrodeposition and Post-deposition Aging of Thin Film Coatings - 6th Quarterly Report
This NASF-AESF Foundation research project report covers the sixth quarter of project work (April-June 2017) on this AESF Foundation Research project at the University of Houston. The objective of the work is to study fundamental and practical aspects of crack formation in electrodeposited thin films.
A new combination of copper immersion and autocatalytic copper-(I)-oxide deposition enables lower palladium concentrations in the activator bath, though the amount of copper deposited on the plastic surface can be up to ten times higher compared to its predecessor processes.
Electrodeposited Inconel and Stellite-like Coatings for Improved Corrosion Resistance in Biocombustors
This work deals with problems in the Third World – namely improving the safety and efficiency of cookstoves used by people around the world. A scalable and economic process is required to apply coatings on low-cost stainless steel substrates for enhanced high temperature corrosion resistance specifically targeted towards biomass combustion apparatus. Cost effective, scalable, and flexible electrodeposition-based coating of various alloys [Ni/Co]-Cr-[Mo/Fe] system, that are able to withstand high temperature corrosion and improve the functional lifetime of existing and next generation bio-combustors components is a desirable technological advancement. Within this context, a wide array of electrolytes and processing parameters were evaluated to develop an ideal alloy coating.
Decorative Electroplating: Theory to Explain Rapid Corrosion Due to Calcium Chloride ‘Russian Mud’ - The 48th William Blum Lecture
This presentation is the 48th William Blum Lecture, presented at SUR/FIN 2010 in Grand Rapids, Michigan on June 14, 2010. In this lecture, Dr. Donald Snyder describes the phenomena behind a new challenge to decorative Cu-Ni-Cr plating, catastrophic corrosion failures involving the use of calcium chloride on Russian highways
This presentation is the 51st William Blum Lecture, presented at SUR/FIN 2014 in Cleveland, Ohio on June 9, 2014. In this lecture, Dr. Yinlun Huang discusses the critical issue of sustainability in manufacturing with the primary focus on the surface finishing industry, and the technology directed toward addressing the issue.
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This presentation is the 52nd William Blum Lecture, presented at SUR/FIN 2015 in Rosemont, Illinois on June 8, 2015. In this lecture, Dr. Hudson Bates discusses the nickel research in his group at the Nickel Producers Environmental Research Association (NiPERA), which impact occupational health and environmental issues for nickel. This includes nano-particulates, toxicity of mixtures, ambient air effects, and providing good science in regulatory matters.
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This presentation is the 53rd William Blum Lecture, presented at SUR/FIN 2016 in Las Vegas, Nevada on June 6, 2016. In this lecture, Dr. Melissa Klingenberg discusses additive manufacturing; that is, any manufacturing process capable of making 3D objects from a digital model, or building-up 3D features onto an existing object, layer-by-layer. Cold spray, thermal spray, electroforming, structural plating and gaseous carbonyl deposition are covered.
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Anodic aluminum oxide (AAO) has been investigated, in terms of influence of the process time, anodizing potential and methanol addition on the structural features of porous anodic alumina formed in 0.1M H3PO4 solution by two-step self-organized anodizing for potentials ranging from 100-150 V. The structural features of the porous structures, including pore diameter and interpore distance, were evaluated from FE-SEM top-view images for samples anodized in the presence and absence of methanol.
For decorative coatings, appearance is the essential purpose for application, but also for functional surface finishes it becomes increasingly relevant as an added value on top of specified technical requirements. Appearance is affected by spectrum and intensity of incident light, roughness and morphology of the coating surface, optical properties of the coating material, eventual superficial oxide films, and individual perception. The predominant factor is surface roughness, which in turn depends on base material roughness, quality of substrate pretreatment, and nucleation and growth kinetics of the electroless nickel (EN) deposit. Interdependency of gloss measurements with roughness measurements and with chemical composition of coatings was investigated for new generation mid-P EN processes and compared to traditional ones.