Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates

Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates

Bibliographic Details
Main Author: Jain, Aman Vinay
Language:English
Published: University of Cincinnati / OhioLINK 2017
Subjects:
Materials Science
Corrosion Inhibtion
Coatings
Metal-Gluconates
Potentiodynamic Measurement
SEM
Mass-spec
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1509983584874447
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15099835848744472021-08-03T07:04:23Z Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates Jain, Aman Vinay Materials Science Corrosion Inhibtion Coatings Metal-Gluconates Potentiodynamic Measurement SEM Mass-spec In the food and pharmaceutical industries, food items containing acetic acid, citric acid, oxalic acid or gluconic acid are often used or stored in contact with aluminum surfaces. There is a high probability that aluminum substrate when used in contact with these acids form complexes that are found to be toxic. Pigment-based systems have been used to control the dissolution of aluminum under these conditions, but pigments cannot be added to food that humans or animals consume. Therefore, there is a need for long-lasting protective coatings on aluminum that will not degrade in contact with acidic food products. In this work, a combination of metal pre-treatment, followed by deposition of thin layer of a metal-gluconate (Zn2+ and Ca2+) based coating on aluminum alloy AA2024, and subsequent heat treatment in the range of 50° to 120°C was found to offer significant corrosion protection in high concentrations of NaCl solution, gluconic acid, solution and in combinations of both. Gluconic acid being strongest of all the three other acids is considered as a representative of those. The influence of the surface pre-treatment and coatings on the corrosion protection and adhesion to aluminum alloy were examined using accelerated corrosion tests. The morphology of the coatings was observed using scanning electron microscopy / EDX and optical microscopy. The chemical structure and composition of the coating solution complex was characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and Inductively coupled plasma mass spectroscopy (ICP-MS). Results revealed that gluconate successfully absorbs calcium acetate and forms a one molecular state solution that provides a strong, compact and adherent film on aluminum. However, despite providing a strong, compact and adherent film on Al, the gluconate and zinc acetate forms two-phase solution that given a non-homogeneous coating with defects and unidentified phases. 2017 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1509983584874447 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1509983584874447 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Materials Science
Corrosion Inhibtion
Coatings
Metal-Gluconates
Potentiodynamic Measurement
SEM
Mass-spec
spellingShingle Materials Science
Corrosion Inhibtion
Coatings
Metal-Gluconates
Potentiodynamic Measurement
SEM
Mass-spec
Jain, Aman Vinay
Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
author Jain, Aman Vinay
author_facet Jain, Aman Vinay
author_sort Jain, Aman Vinay
title Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
title_short Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
title_full Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
title_fullStr Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
title_full_unstemmed Corrosion Inhibitive Properties of Metal-Gluconate Coatings on Al Substrates
title_sort corrosion inhibitive properties of metal-gluconate coatings on al substrates
publisher University of Cincinnati / OhioLINK
publishDate 2017
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1509983584874447
work_keys_str_mv AT jainamanvinay corrosioninhibitivepropertiesofmetalgluconatecoatingsonalsubstrates
_version_ 1719453196775063552

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