Generation of Hot Dip Galvanized Coated Sheet Certified Reference Materials Using X-Ray Fluorescence and Gravimetry

A method for the generation of hot dip galvanized sheet steel Certified Reference Materials (CRMs) certified for coating mass is described. The method produces high quality coating mass CRMs with combined estimated uncertainties (95% confidence) of about 3% relative standard deviation (rsd). Initial...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials engineering and performance 2003-10, Vol.12 (5), p.499-506
Main Authors: Crawford, Larry F, Simpson, Theresa, Friedersdorf, Fritz J
Format: Article
Language:English
Subjects:
Coating
Confidence intervals
Correlation
Fluorescence
Mathematical analysis
Reference materials
Uncertainty
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A method for the generation of hot dip galvanized sheet steel Certified Reference Materials (CRMs) certified for coating mass is described. The method produces high quality coating mass CRMs with combined estimated uncertainties (95% confidence) of about 3% relative standard deviation (rsd). Initially, coating mass x-ray fluorescence (XRF) data are collected on multiple test specimens and used to sort the test specimens by observed coating mass. Several specimens near the mean of the sorted data are retained and the remaining specimens are analyzed for coating mass by a National Institute for Standards and Testing (NIST) traceable weigh-strip-weigh analytical method. The weigh-strip-weigh data are correlated to the initial XRF data using statistical techniques. The retained specimens' coating masses are calculated using this relationship and are used as the certified coating masses for the retained specimens. This correlation method is a more accurate and efficient technique relative to the traditional "perimeter" certification methods. The present method does not suffer from an increased estimated uncertainty due to the inherent hot dip Zn coating variability. Also, this method provides a simple means to generate NIST traceable high quality CRMs that can be tailored to meet individual users' requirements.
ISSN:1059-9495
1544-1024
DOI:10.1361/105994903100277139