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CORRISION COMMENTARY

CORRISION COMMENTARY CORROSION OF ANALYTICAL WEIGHTS. SCIENTISTS in the Metrology Division of the National Physical Laboratory were recently called on to discover the effect of chemical laboratory atmospheres on the mass and therefore the accuracy of analytical weights. They were particularly concerned with tinnickel plated brass weights. They used 100 g. weights and exposed them in ventilated containers suspended above head level in three typical chemical laboratories for three months. The weights least affected were made of 2520 stainless steel and they were highly polished. Their mean change of mass in three months' exposure was only 0.12 mg. A normal production grade of the same stainless steel changed 0.20 mg. in that period. A change of 0.22 mg. was observed with rhodiumplated brass weights. For practical purposes the new weights tinnickel plated brasswere as little affected as the rhodiumplated and 2520 stainless steel weights. The best of three typesplated with 15 Sn Ni on 15 Cuin fact gained only 0.22 mg. The other two types, 30 Sn Ni and 15 Sn Ni changed 0.24 and 0.28 mg. respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

CORRISION COMMENTARY

Anti-Corrosion Methods and Materials , Volume 1 (4): 3 – Apr 1, 1954

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/eb018924
Publisher site
See Article on Publisher Site

Abstract

CORROSION OF ANALYTICAL WEIGHTS. SCIENTISTS in the Metrology Division of the National Physical Laboratory were recently called on to discover the effect of chemical laboratory atmospheres on the mass and therefore the accuracy of analytical weights. They were particularly concerned with tinnickel plated brass weights. They used 100 g. weights and exposed them in ventilated containers suspended above head level in three typical chemical laboratories for three months. The weights least affected were made of 2520 stainless steel and they were highly polished. Their mean change of mass in three months' exposure was only 0.12 mg. A normal production grade of the same stainless steel changed 0.20 mg. in that period. A change of 0.22 mg. was observed with rhodiumplated brass weights. For practical purposes the new weights tinnickel plated brasswere as little affected as the rhodiumplated and 2520 stainless steel weights. The best of three typesplated with 15 Sn Ni on 15 Cuin fact gained only 0.22 mg. The other two types, 30 Sn Ni and 15 Sn Ni changed 0.24 and 0.28 mg. respectively.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Apr 1, 1954

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