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

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 solutio...

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Bibliographic Details
Published in:Applied sciences 2020-04, Vol.10 (8), p.2753
Main Authors: Burduhos-Nergis, Diana-Petronela, Vizureanu, Petrica, Sandu, Andrei Victor, Bejinariu, Costica
Format: Article
Language:English
Subjects:
Aluminum
Carbon steel
Chemical analysis
Civil engineering
Coatings
Corrosion
Corrosion environments
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Elastomers
Electrochemical impedance spectroscopy
Electrochemistry
Extinguishing
Fasteners
Iron
Manganese
manganese phosphate layer
Manufacturing
Molybdenum
Morphology
Navigation
Oil and gas industry
Phosphate coatings
Phosphates
Protective coatings
Radiometers
Rain water
Rescue operations
Scanning electron microscopy
Seawater
Software
Spectroscopy
Spectrum analysis
Steel
Water analysis
Zinc
Zinc coatings
Zinc phosphate
zinc phosphate layer
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10082753