SUR/FIN 2021 exhibitor Hunter Chemical’s NiMax Tablets add nickel to hot-dip galvanizing kettles, which the company says leads to more efficient use of the metal.
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Hunter Chemical’s NiMax Tablets add nickel to hot-dip galvanizing (HDG) kettles. According to the company, NiMax is unique because the particle size of the nickel powder contained within the tablet falls within a controlled range, leading to a more efficient use of nickel. Hunter also offers nickel in powder form for the HDG industry, as well as other nickel, carbon and chromium-based materials for other surface finishing processes.
Cyanide in mining and industrial wastewaters has been around from the beginning, including electroplating processes. This presentation reviews a number of current processes, and in particular, offers new technologies for improvement in cyanide destruction by the most common process, using sodium hypochlorite.
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.
Research at the authors’ laboratories has focused on pulse/pulse reverse electrolysis on cathodic processes, such as hard chromium plating from non-hexavalent chemistries. This papers describes studies into pulse/pulse reverse electrolysis as applied to electrochemical metal removal processes, such as electropolishing and electroetching.
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