Materials Performance

MAR 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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49 MATERIALS PERFORMANCE: VOL. 57, NO. 3 MARCH 2018 Continued on page 50 Shore Hardness Durometer 1 -800-448-3835 l www. d efelsko. com D eFelsko Corporation l O gdensburg, N ew Yor k USA Tel: + 1-315-393-4450 l Email: t echsale@defelsko.com Measures the hardness of non-metallic materials. Two models are available - S hore A and Shore D N EW n U ser-adjustable measurement time with onscreen countdown n Auto Ignore mode disregards readings below 20 or above 90 n Internal memory, stat istics and USB port n Includes PosiSof t suite of software for viewing and reporting dat a n Advanced models connect to iOS or Andr oid Smar t devices n Conforms to national and international standards n Certificate of Calibration showing traceability to NIST included thickness), over application in some areas will not cause the coating to crack. e coating was first developed in the 1970s. A NASA team at Goddard Space Flight Center (Greenbelt, Maryland, USA) was looking for a zinc anticorrosion coating that was easier and more cost effective to use, so the chemists experimented with coating formulas and combined zinc pow der and K 2 SiO 3 to protect metal surfaces from corrosion. e end result was an effec tive and durable coating that chemically bonded with the underlying material to provide protection against sea spray, fog, and other corrosive elements. e protec tion continued even if the coating was scratched. NASA licensed its patent to a company (Inorganic Coatings) so the coating could be sold in the private sector. Because the patents described the raw materials with very basic instructions, however, the com pany needed to refine the manufacturing process of liquid K 2 SiO 3 , a key component of the coating, before producing the coating commercially. With the help of two chemical engineers at Polyset, Inorganic Coatings reworked the process until consistently good results were achieved. e two companies then signed an agreement calling for Polyset to provide the liquid K 2 SiO 3 exclusively for the NASA derived coating. Later, to save on costs, Inorganic Coatings tried unsuccessfully to produce the liquid K 2 SiO 3 on its own. Because it was manufactured incorrectly, the coating turned back into a liquid when exposed to dew or rain. When Inorganic Coatings stopped pro ducing the zinc silicate coating, other com panies began making the NASA coating with liquid K 2 SiO 3 manufactured by Polyset. Whenever the anticorrosion coating deliv ered was not manufactured with Polyset's liquid K 2 SiO 3 , the coating again turned into a liquid. Due to the delivery of incorrectly manufactured batches and the advances made in other coating technologies at the time, the NASA developed zinc silicate coating fell out of use. e NASA formula, when manufactured correctly, is still one of the best products available to prevent corrosion of metals, according to Earl Ramlow, who started Continued f rom page 47 using the coating more than 20 years ago as an engineer working for a military contrac tor. In 2010, Polyset started marketing the coating directly to market under its own brand name, WB HRZS Single Coat System, and brought the coating back into use. Source: NASA Spinoff 2017, spinoff.nasa. gov; and Polyset, www.polyset.com. Melting Can Inhibit Bonding of Metal Coatings Researchers at Massachusetts Institute of Technology (MIT) (Cambridge, Massachu setts, USA) have found that in some situa tions, metal melting can inhibit metal bonding rather than promote it. e

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