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Open AccessArticle

Evaluation of the Corrosion Resistance of Phosphate Coatings Deposited on the Surface of the Carbon Steel Used for Carabiners Manufacturing

1
Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Dimitrie Mangeron street, 67, 700050 Iași, Romania
2
Romanian Inventors Forum, Sf. P. Movila 3, 700089 Iasi, Romania
3
National Institute for Research and Development in Environmental Protection, 294 Splaiul Independentei Blvd, 060031 Bucharest, Romania
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2753; https://doi.org/10.3390/app10082753
Received: 18 March 2020 / Revised: 11 April 2020 / Accepted: 13 April 2020 / Published: 16 April 2020
(This article belongs to the Special Issue Obtaining, Characterization and Applications of Advanced Materials)
This study aims to evaluate the corrosion resistance of carbon steel, used for carabiners manufacturing, coated with three different types of phosphate layer. The phosphate layers have been obtained by phosphate conversion coating with three different types of phosphate solutions: zinc-based solution, zinc-iron-based phosphate solution, and manganese-based phosphate solution. Additionally, the test was performed on zinc phosphate samples impregnated with molybdenum bisulfate-based oil and zinc phosphate samples further coated with a layer of elastomer-based paint. Considering the areas where the carabiners are used (civil engineering, navigation, oil industry, rescue operations, etc.), the corrosive environments studied are rainwater, Black Sea water, and fire extinguishing solution. The structure of the deposited layers was studied by scanning electron microscopy, while the interface structure between the alloy and corrosive environment was analyzed by electrochemical impedance spectroscopy. According to this study, the corrosion resistance of zinc-based phosphate coated samples and zinc/iron-based phosphate coated samples is higher than that of the studied carbon steel samples, despite the corrosion environment. Also, the most aggressive corrosion environment was the fire extinguishing solution. View Full-Text
Keywords: corrosion resistance; carbon steel; zinc phosphate layer; manganese phosphate layer; electrochemical impedance spectroscopy corrosion resistance; carbon steel; zinc phosphate layer; manganese phosphate layer; electrochemical impedance spectroscopy
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Burduhos-Nergis, D.-P.; Vizureanu, P.; Sandu, A.V.; Bejinariu, C. Evaluation of the Corrosion Resistance of Phosphate Coatings Deposited on the Surface of the Carbon Steel Used for Carabiners Manufacturing. Appl. Sci. 2020, 10, 2753.

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