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Showing 211 – 220 of 246 resultsSolvent substitution for maintenance and overhaul operations of military systems has been a primary environmental concern for many years. Cadmium replacement in these systems has been targeted for decades. Both of these areas have a common obstacle for implementation of any potential alternate. Hydrogen embrittlement of high strength steel is the most predominant unforeseen hurdle since high strength materials show sensitivity to the phenomena and the source of the hydrogen can be anything within the fabrication process, maintenance practice or the natural corrosion cycle. Standardized testing on this issue has traditionally stemmed from the aerospace industry where it is a principal focus.
The John Deere Des Moines Works in Ankeny, IA is thriving, thanks to a combination of state-of-the-art technology and an inventive management philosophy…
Question: I enjoy your specific, accurate responses to questions, even when the subject is out of our “field of view.” I’m the part-time environmental/safety manager for a small custom coater.
The reasons for installing an in-house cold blackening system are many and varied.
Eliminating emissions, stack testing, fume scrubbers...
A novel hexavalent chromate-free conversion coating was developed to improve anti-corrosion and adhesive-bonding characteristics of the magnesium alloys and zinc-nickel (Zn-Ni) plated steel substrates. The corrosion behavior of the coated and uncoated alloys was investigated by neutral salt fog (NSF) and electrochemical corrosion tests. Surface wettability of the pretreated substrates was investigated by static contact angle measurements. Wet-tape adhesion tests verified that there is strong adhesion between the primer and the chem film-treated substrates. The morphology and composition of the coated surfaces were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) methods. This trivalent chromium-based surface treatment is a potential hexavalent chromate conversion coating replacement for magnesium alloys and Zn-Ni plated steel.
Ionic liquids have also been considered for parts cleaning applications because of their negligible vapor pressure, high thermal and electrochemical stability, and low melting points of less than 100°C.
How Astroplate extended bath life using filtration and other techniques...
