Download or read book Electrochemical Characterization of Plasma Polymer Coatings in Corrosion Protection of Aluminum written by Yen-Fong Chan and published by . This book was released on 2005 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-temperature plasma polymerization is a new and promising pretreatment technique to create environmentally friendly coating systems with good corrosion protection for aluminum (Al) alloys. The effects of plasma pretreatment and plasma polymerization on corrosion protection of alclad Al alloy 2024-T3 ([2A]) were characterized using electrochemical techniques, including cyclic polarization (CP) and electrochemical impedance spectroscopy (EIS). The [2A] panels were coated with an ultrathin layer (~50 nm) of plasma polymers in a direct current (dc) glow discharge of trimethylsilane (TMS) or its mixtures with O 2 or N 2 . The CP measurement results showed that the plasma polymer coated [2A] panels exhibited more negative corrosion potentials (E corr), smaller corrosion currents (I corr), and no surface passivation when compared with uncoated [2A] panels. The lower values of I corr imply a higher corrosion resistance on the plasma polymer coated [2A]. When investigated using EIS, these plasma polymer coated [2A] panels exhibited higher impedance at low frequency when first immersed in electrolyte solution, yet degraded quickly to the similar level as uncoated controls within one day of immersion. These results illustrated that thin plasma polymer films provided a certain but very limited corrosion resistance to [2A] substrate; their dominant role in plasma interface engineered coating systems still lies mostly in their adhesion enhancement at metal/paint interface as observed in our previous studies and further confirmed in this study.

Download or read book Electrochemical Characterization of Plasma Polymer Coatings in Corrosion Protection of Aluminum Alloys written by Yen-Fong Chan and published by . This book was released on 2005 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations of Conductive Polymer Coatings for Corrosion Protection of Aluminum Alloys written by Robert James Racicot and published by . This book was released on 1997 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plasma Electrolytic Oxidation PEO Coatings written by Marta Mohedano and published by MDPI. This book was released on 2021-06-02 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma electrolytic oxidation (PEO), also known as micro-arc oxidation (MAO), functionalizes surfaces, improving the mechanical, thermal, and corrosion performance of metallic substrates, along with other tailored properties (e.g., biocompatibility, catalysis, antibacterial response, self-lubrication, etc.). The extensive field of applications of this technique ranges from structural components, in particular, in the transport sector, to more advanced fields, such as bioengineering. The present Special Issue covers the latest advances in PEO‐coated light alloys for structural (Al, Mg) and biomedical applications (Ti, Mg), with 10 research papers and 1 review from leading research groups around the world.

Download or read book Corrosion and Protection of Light Metal Alloys written by Rudolph G. Buchheit and published by The Electrochemical Society. This book was released on 2004 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: "These proceedings represent contributions to the Symposium on the Corrosion and Protection of Light Metals, held at the 204th Meeting of the Electrochemical Society, October 12th through 17th, 2003, in Orlando, Florida."--P. iii.

Download or read book Corrosion Resistance Characterization of Coating Systems Used to Protect Aluminum Alloys Using Electrochemical Impedance Spectroscopy and Artificial Neural Networks written by Federico Gambina and published by . This book was released on 2010 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The exposure and EIS characterization of the chromate-free coatings systems enabled a ranking of the coatings systems in terms of corrosion protection provided. Coating systems were ranked according to several different methods described in the literature. Among the coatings evaluated, Deft 02GN084, a high solids, solvent-borne and Pr-containing primer coating showed best protection when used in conjunction with a number of different conversion coatings and surface pretreatments. Several different trivalent chromium conversion coatings and pretreatment were used. This general type of conversion coating appeared to provide better corrosion protection than other pretreatments whose functions were primarily surface cleaning or adhesion promotion.

Download or read book Corrosion Protection of Metals and Alloys Using Graphene and Biopolymer Based Nanocomposites written by Hatem M.A. Amin and published by CRC Press. This book was released on 2021-02-15 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from experts from both academia and industry, this book provides up-to-date reviews and promising approaches for corrosion control of metals and alloys via sustainable biopolymers and carbon nanomaterials coatings, focusing on the wonder material “graphene” which is more solid than steel. This book delivers essential information for improving the environmental and economic viability of current coating technologies. It is also a valuable reference for those who are interested in corrosion science and corrosion protection including professionals from the industry as well as academia.

Download or read book Silanes and Other Coupling Agents written by K. L. Mittal and published by BRILL. This book was released on 2009-03-16 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume chronicles the proceedings of the Fourth International Symposium on Silanes and Other Coupling Agents.This volume and its predecessors containing bountiful information should serve as a reference source for the latest R&D activity in the arena of coupling agents. Anyone interested or involved in promoting adhesion between dissimilar materials for any application should find this volume of great use and value.

Download or read book Recent Researches in Corrosion Evaluation and Protection written by Reza Shoja Razavi and published by BoD – Books on Demand. This book was released on 2012-01-25 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to present and discuss the recent methods in corrosion evaluation and protection. The book contains six chapters. The aim of Chapter 1 is to demonstrate that Electrochemical Impedance Spectroscopy can be a very useful tool to provide a complete evaluation of the corrosion protection properties of electro-coatings. Chapter 2 presents results of studies of materials degradation from experimental electrochemical tests and theoretical calculations. Chapter 3 deals with the presentation of the corrosion and corrosion prevention of the aluminum alloys by organic coatings and inhibitors. Chapter 4 addresses the new method of pigment preparation that can improve protection efficiency. The effectiveness of plasma deposited films on the improvement of carbon steel corrosion resistance is discussed in Chapter 5. Chapter 6 deals with the conjugation of carbon nanotubes with organic-inorganic hybrid to prepare hybrid coatings that combine high anti-corrosion efficiency with elevated mechanical resistance.

Download or read book Formation of Corrosion Resistant Organic Polymer Coatings by an Electrochemical Process written by Jude Iroh and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project dealt with the formation, characterization and properties of corrosion resistant polypyrrole and substituted polypyrrole coatings. Aqueous electropolymerization was used to apply polypyrrole coatings onto low carbon steel (99.9% (Fe), 0.1% C). Galvanostatic electropolymerization was used throughout the course of this project. The progress of electropolymerization was followed by tracing the potential time (E-t) curve as a function of the reaction variables. Aqueous electropolymerization of pyrrole and methylpyrrole occurred instantaneously in basic medium (pH>/= 8.4). However, three distinct reactions occurred in acidic medium (pH /= 6.0). These reactions were identified as the oxidation of steel, passivation of steel and polymerization. Polymerization commenced after steel was completely covered by the passive coatings. The transition of steel from a reactive substrate to a passive substrate is marked by the change in the electrode potential from negative values (approx.-0.44 vs SCE) to positive values 0.65 vs SCE. The passivation time decreased with increased applied current. In acidic medium, the passivation time was minimum at pH 2.4. The adhesion strength of the polypyrrole coated steel was determined to be about 56% higher than that for uncoated steel. The adhesion strength varied with the electrochemical process parameters. Low pH and low current densities produced coatings with highest adhesion strength approx. 23 MPa. The corrosion rate of the polypyrrole coated steel was shown to be very low 2.9 - 0.16 mpy compared to that for the control of about 41.36 mpy.

Download or read book Plasma Polymerized Coatings for Improved Corrosion Resistance written by Yang Zhou and published by . This book was released on 2018 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tens of billions of dollars are spent on corrosion problems every year in the US by the Department of Defense alone. Polymer coating systems are widely used for protecting the metal by preventing water transport through the coating and contact with the metal. Due to the environmental hazards associated with hexavalent chromium and volatile organic contents from traditional polymer coating systems, there is an urgent need to develop new types of coatings. These concerns have drawn attention to ecologically friendly coatings deposited with vapor deposition techniques like plasma enhanced chemical vapor deposition (PECVD). In this work, we not only have developed plasma polymerized (pp) coatings for improved corrosion resistance, but also have characterized their structures and properties with various techniques. Firstly, we started with plasma polymerized coatings from well-established vacuum based PECVD to understand their water resistance and corrosion resistance. An Al panel coated with plasma polymerized maleic anhydride (pp-MA) corroded after one day in salt spray, while a similarly thin (~30 nm) plasma polymerized hexamethyldisiloxane (pp-HMDSO) coating protected an Al panel for a period on the order of one month. The behavior seen with macroscopic tests was consistent with nanoscale characterization with Neutron Reflectivity and Sum Frequency Generation Spectroscopy that showed slow water penetration through a pp-HMDSO coating and water accumulation at the pp-MA/substrate interface. In addition, off specular X-ray measurement showed that the interfacial water disrupted the conformality of the pp-MA coating with the substrate. Secondly, we used plasma polymerized coatings as primer to improve the corrosion resistance of a whole coating system. Both electrochemical impedance spectroscopy (EIS) measurements and salt spray tests showed that using a thin pp-HMDSO coating as a primer under a polyurethane (PU) topcoat can increase the corrosion resistance by a factor of 10 times over that for a PU topcoat directly on an Al panel. The poorly adhesion to the topcoat with hydrophobic pp-HMDSO can be improved with gradient coatings using surface modification of the pp-HMDSO coating. The coatings with plasma polymerized primers showed better corrosion resistance than those of PU on Al and PU on chromate treated Al after 1-month, 3-month and 6-month field tests in a harsh seashore environment in Hawaii. Thirdly, we modified surface fluctuations of polymer melt films by modifying the substrate surface with PECVD. The surface fluctuations of polystyrene thin film with thickness around 3 Rg on pp-MA modified silicon substrate showed less confinement than did similarly thick films on bare silicon. There was no confinement for either case when film thickness was larger than 4 Rg. The difference in confinement was related to the different strongly adsorbed layers on the different substrates. The surface of a polystyrene thin film with thickness around 4 Rg on a pp-HMDSO modified silicon substrate showed faster fluctuations and cannot be described with the HCT theory. This could due to slip at the interface between PS and pp-HMDSO. Finally, we developed plasma polymerized organic coatings deposited in air using atmospheric pressure PECVD (APPECVD). A coating from the same precursor, HMDSO, deposited at atmosphere with APPECVD was hydrophilic and inorganic in character. Using the low oxygen content monomer tetramethylsilane or hexamethyldisilazane, we successfully developed hydrophobic coatings with higher relative carbon contents.

Download or read book Characterization of Alumina Coatings on Steel Prepared by Plasma Electrolytic Oxidation written by Sushma Priyanka Karanam and published by . This book was released on 2017 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma electrolytic oxidation (PEO) is an electrochemical surface treatment process used to produce crystalline oxide coatings on metals. PEO process is characterized by applying high voltage in a cyclic manner (cathodic and anodic) to the substrate immersed in an electrolyte solution. This high voltage induces electrolysis and results in the migration of charged ions onto the anodic substrate, resulting in the formation of crystalline oxide coatings on the substrate. The processing conditions and the electrolyte used can affect the microstructure, as well as physical, chemical and mechanical properties of the coating. Depositing an aluminum oxide layer on steel substrate can enhance its mechanical properties and corrosion resistance.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Generation Coatings for Metals written by Anthony E. Hughes and published by MDPI. This book was released on 2020-11-09 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent decades, there have been extensive developments in science and technology. These advances provide new techniques to deposit coatings onto various substrates, thus, addressing the ever-increasing performance requirements of various applications. Moreover, as technology itself develops, there are new problems that require new solutions, some of which can be solved through the application of coatings. Thus, the demands from coatings are continually increasing and the field is growing. The collection of articles contained within this volume cover a wide range of different research approaches to coatings reflecting the expanding field of coatings. It covers examples from topics such as a cold spray of magnesium alloys onto steel substrates, mechanical coatings of Ti-based materials onto steel balls, electroless plating of Ni-P coating onto an Mg-based alloy, magnetron sputtering of Ru-Zr coatings onto a Si wafer, a review of ionic liquids that form surface layers, as corrosion inhibitors, nano-composite epoxy coatings containing exfoliated clay (montmorillonite) for steel protection, a coating based on plasma electrolytic oxidation of an aluminum alloy and inhibited epoxy primer for aerospace aluminum alloys. This volume provides a wide-angle snapshot of current coating technologies through the presentation of some specific studies.

Download or read book Forming Protective Coatings on Aluminum Using Spontaneous and Electro Polymerization written by Rajat K. Agarwal and published by . This book was released on 1997 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Protective Coatings and Corrosion Protection written by Oleksandr Vasiliev and published by Trans Tech Publications Ltd. This book was released on 2024-02-15 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer-reviewed papers only