Products Finishing

OCT 2013

Products Finishing magazine is the No. 1 industrial finishing publication in the world. We keep our readers informed about the latest news and trends in plating, painting, powder coating, anodizing, electrocoating, parts cleaning, and pretreatment.

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Page 15 of 115

NASF REPORT California Proposes New Drinking Water Standard for Hex Chrome California just announced its proposed new drinking water standard for hex chrome of 10 parts per billion—the frst drinking water standard specifcally for hex chrome. (See related article on p. 8.) This proposal is signifcantly less stringent than the ambitious California public health goal of 0.02 ppb. The federal standard for total chromium is currently 100 ppb and the California standard is 50 ppb. The state's drinking water agencies have been pushing for a standard of 20 ppb and indicated that a standard of 1 ppb would be too expensive to implement. Environmental groups have already indicated that the newly proposed California standard is not stringent enough. In the meantime, the U.S. EPA is in the process of evaluating the potential human health efects of hex chrome in drinking water as part of its IRIS process. Although the federal risk assessment and review process is separate from the California proposal, federal oficials are expected to follow California when it is eventually ready to issue a proposed new drinking water standard. NASF will continue to monitor developments and maintain NASF TECHNICAL PAPERs By Nicole Micyus, MacDermid Inc. The corrosion resistance of high-phosphorus electroless nickel (EN) is well known. Typically, high phosphorus deposits of 1-mil (25-µm) thickness or more can pass 1,000 hours in neutral salt spray (NSS) testing. It has been shown that duplex EN coatings using high phosphorus as a base deposit can yield NSS results well above 1,000 hours with low/mid- and mid-phosphorus EN deposits. A high-phosphorus electroless nickel is the lower layer, which provides corrosion resistance, while the upper layer endows a particular property needed for a specifc application. In this paper, the upper layer consists of a codeposition EN deposit with particles such as polytetrafuoroethylene (PTFE) and boron nitride (BN). Both EN/PTFE and EN/BN deposits provide a lower coeficient of friction than that of high-phosphorus EN. They are utilized primarily in the automotive, machinery, engineering, and mold and die industries. The lower coeficient of friction deposits provide the hardness of electroless nickel and the lubricity of PTFE or BN. The incorporation of PTFE particles provides dry lubrication and improved release properties. Some applications include plating molds and dies, self-lubrication for electronics and other sensitive equipment, and low friction wear against mated surfaces. The incorporation of BN particles improves the sliding friction characteristics of electroless nickel. EN/BN OCTOBER 2013 — Join the NASF 1000 – Support the Industry's Public Policy Efforts The NASF 1000 is a long-term initiative to sustain and advance the industry's policy advocacy and legal defense activities. Companies and individuals who invest in the efort help the NASF challenge regulatory threats to the surface fnishing industry. Information on how you can support your industry and be a part of the NASF 1000 is available at nasf-1000.php. Edited by James Lindsay, NASF Technical Editor Corrosion Resistance of High-Phosphorus EN with a Lower Coefficient of Friction, Nanoparticle Codeposition Electroless Nickel Layer 14 active participation in the hex chromium stakeholders groups in Washington, DC. California will be taking comments on the proposed regulation until Oct. 11, 2013. More information is available on the California Department of Public Health website at Pages/Chromium6.aspx. For additional information, contact Jef Hannapel at deposits can withstand higher abrasion forces and higher temperatures compared to EN/PTFE. EN/PTFE and EN/BN are both porous deposits that provide poor corrosion resistance. This study investigates whether or not the codeposition overlayer improves, decreases or has any efect on the corrosion resistance of the high-phosphorus base layer when compared to a single layer of high-phosphorus electroless nickel. Varying amounts of codeposited particles and varying layer thicknesses are explored. The full paper can be accessed and printed from short.pfonline. com/NASF13Oct1. NASF/AESF Foundation Research Project Report: Electrodeposition of Ni-Fe-Mo-W Alloys (AESF Research Project #R-117: 1st Q Report, Jan.-March 2013) By Prof. E.J. Podlaha-Murphy, Project Director and Professor of Chemical Engineering, Northeastern University The National Association for Surface Finishing, through its educational arm, the AESF Foundation, funds the NASF/AESF Research Program. Dating back to the 1930s and beginning with the frst projects at the National Bureau of Standards (now the National Institute for Science and Technology), NASF/AESF Research has advanced industrial research in surface fnishing technology, as well as educated countless engineers and researchers in the science of our feld. Last year, the research board awarded a three-year grant to fund work at Northeastern University. The project, titled

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