Use of GDOES method for evaluation of the quality and thickness of hot dip galvanised coating. (2nd November 2018)

• Record Type: Journal Article
• Authors: Vontorová, J.; Mohyla, P.
• Is Part Of: Transactions of the Institute of Metal Finishing. Volume 96:Number 6(2018)
• Page Start: 313
• Page End: 318
• Publication Date: 2018-11-02
• Subjects: Zinc coating -- GDOES -- optical microscopy -- hot dip galvanising -- thickness; Metals -- Finishing -- Periodicals; Metals -- Surfaces -- Periodicals; Metallurgy -- Periodicals; 671.705
• DOI: 10.1080/00202967.2018.1520531
• Languages: English
• ISSNs: 0020-2967

Abstract

ABSTRACT: The paper describes an assessment of thickness and quality of hot-dip galvanised coating by means of the glow discharge optical emission spectrometry method (GDOES). For comparison, a metallographic analysis was made using an optical microscope. An important factor influencing thickness and quality of the hot-dip galvanised coating is chemical composition of steel, particularly the amounts of silicon. Structural steels with a low amount of silicon S235JR and S355J2 were chosen for the experiment and high-strength steel S690QL with a high amount of silicon was chosen for comparative purposes. The results of the coating thickness measurement by means of GDOES and optical microscopy show only minimal differences. Steel S690QL shows a thick and uneven zinc coating. In the case of steels S235JR and S355J2 an optimal hot-dip galvanised coating was observed.