ABOUT THE LIFETIME OF COATING THICKNESS STANDARDS (ZINC ON STEEL)
Journal: NDT WORLD
Volume 19 № 1
, 2016
Rubrics: METROLOGY
Authors:
1.
The Russian Research Institute for Metrological Service
(laboratoriya obespecheniya edinstva izmereniy geometricheskih parametrov metodami NK, nachal'nik)
Moskva, Moscow, Russian Federation
Moskva, Moscow, Russian Federation
2.
The Russian Research Institute for Metrological Service
(glavnyy nauchnyy sotrudnik)
Moscow, Russian Federation
Moscow, Russian Federation
Type:
Article
Pages:
from 69
to 71
Status:
Published
Received:
02.03.2016
Accepted:
30.03.2016
Published:
30.03.2016
Language:
Russian
Keywords:
coating thickness standard, thickness gauge, thickness, verification
Abstract (English):
Introduction. Coating thickness standards are necessary for verifying the accuracy and operation of coating thickness gauges and are an important component in fulfilling quality control requirements. That is why great attention is paid to the standards’ metrological parameters during their usage. The lifetime of the zinc on steel standards was the subject of this study. Method. For estimating the lifetime of the standard the concept of “average life” was used, which was a standard’s metrological reliability indicator and was determined by the number of measurements when standard’s error did not exceed the maximum permissible error. Metrological parameters of a set of zinc on steel standards were measured at a year intervals during 5 years. Each standard had its unique number and a certain coating thickness. Results. The results of coating thickness measurements are given in the article as well as mean square deviations and other parameters. Analysis of the results has shown that changes of thickness value are random and are within the permissible error interval. Conclusion. Application of zinc coating for coating thickness standards (zinc on steel) assures the standards’acceptable average life provided the requirements for the operating conditions are met.
Introduction. Coating thickness standards are necessary for verifying the accuracy and operation of coating thickness gauges and are an important component in fulfilling quality control requirements. That is why great attention is paid to the standards’ metrological parameters during their usage. The lifetime of the zinc on steel standards was the subject of this study. Method. For estimating the lifetime of the standard the concept of “average life” was used, which was a standard’s metrological reliability indicator and was determined by the number of measurements when standard’s error did not exceed the maximum permissible error. Metrological parameters of a set of zinc on steel standards were measured at a year intervals during 5 years. Each standard had its unique number and a certain coating thickness. Results. The results of coating thickness measurements are given in the article as well as mean square deviations and other parameters. Analysis of the results has shown that changes of thickness value are random and are within the permissible error interval. Conclusion. Application of zinc coating for coating thickness standards (zinc on steel) assures the standards’acceptable average life provided the requirements for the operating conditions are met.
Keywords:
coating thickness standard, thickness gauge, thickness, verification
coating thickness standard, thickness gauge, thickness, verification
1. Babadzhanov L. S., Babadzhanova M. L. Metrologicheskoe obespechenie izmereniy tolshchiny pokrytiy. Teoriya i praktika [Metrological Assurance of Coating Thickness Measurements. Theory and Practice]. Moscow, IPK Izd-vo standartov, 2004, 264 p. (in Russ.).
2. Р 50.2.006-2001. Gosudarstvennaya poverochnaya skhema dlya sredstv izmereniya tolshchiny pokrytiy v diapazone ot 1 do 20000 mkm [National System for Standardization of Measurements. National Verification System for Coatings Thickness Measurement Instruments in the Range 1-20,000 Micrometers]. Moscow, IPK Izdatel´stvo standartov, 2001.
