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Open AccessArticle

Pitting Corrosion of Hot-Dip Galvanized Coatings

1
Bridge Department, Road and Bridge Research Institute, 03-302 Warsaw, Poland
2
Associazione Italiana Tecnici Industrie Vernici ed Affini (AITIVA), 29-122 Piacenza, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(9), 2031; https://doi.org/10.3390/ma13092031
Received: 16 March 2020 / Revised: 20 April 2020 / Accepted: 24 April 2020 / Published: 26 April 2020
(This article belongs to the Special Issue Materials and Coatings for Extreme Environments)
Lead (Pb) addition to hot-dip galvanizing (HDG) baths affects the physical characteristics of zinc coatings and is also useful to protect kettles. The influence of lead additions on both corrosion rate and morphology as well as on structure of zinc coating is less investigated. In this paper, three different additions, (Pb = 0.4–0.8–1.2 w/w) were chosen for three series of steel substrates, plus references without lead. The three steels chosen as substrates contained silicon (Si) = 0.18, 0.028, 0.225 w/w, respectively. The experimental part included both macro- and micro-electrochemical measurements, weight loss vs. time plots, Glow Discharge Optical Emission Spectroscopy (GDOS) and SEM/EDX microanalysis of both surface and cross-section of samples. Lead concentration is responsible for evident bimetallic coupling in the surrounding of lead inclusion with consequent increased dissolution rate, chunk effect, and rougher surface morphology. View Full-Text
Keywords: HDG coating; lead in HDG bath; silicon in steel; corrosion HDG coating; lead in HDG bath; silicon in steel; corrosion
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MDPI and ACS Style

Królikowska, A.; Komorowski, L.; Bonora, P.L. Pitting Corrosion of Hot-Dip Galvanized Coatings. Materials 2020, 13, 2031.

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