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Showing 211 – 220 of 242 resultsMist suppressants are an important tool for reducing exposure of workers to Cr(VI) during plating and etching operations. A common raw material used for efficient mist suppressants was, and still is, PFOS. PFOS is subject to legislation across the world prohibiting its use for many applications. In this paper we will present developments and experiences with non-PFOS, permanent and non-permanent mist suppressants.
Solvent 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 reasons for installing an in-house cold blackening system are many and varied.
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.
Minnesota shop focuses on lean manufacturing, energy conservation
A comprehensive review of catalytic oxidizer components is necessary when considering the purchase of a catalytic oxidizer system...
Trends in coating and finishing for aerospace and defense
