Riyad Hussein

University of Windsor · Department of Mechanical, Automotive, and Materials Engineering

Although magnesium alloys have found application in the automotive, aerospace, defense, communications and computer hardware industries, their more widespread application has been restricted by a susceptibility to corrosion, especially in acidic and salt-water environments. Several surface treatments have been used to enhance the corrosion resistan...

To investigate magnesium/magnesium alloy active corrosion an electrokinetic model has been developed. Using the Visual Basic for Applications™ programming platform, integrated within Excel™ spreadsheets, a computer application Magnesium Symadec was constructed. To set reversible potentials of occurring half reactions, pH-Potential diagrams for Magn...

Magnesium and its alloys are finding increasing usage in light-weighting applications such as in the automotive industry. However, magnesium is a highly reactive, relatively low melting point metal and, thus, has inherently poor corrosion and wear resistance. Enhanced corrosion and tribological properties can be obtained through the use of coatings...

Magnesium and its alloys are attractive to the automotive industry for their inherent light-weight which leads to highly fuel-efficient design. However, due to a low melting temperature (650°C), magnesium has relatively poor elevated temperature mechanical properties, e.g., creep. This has, therefore, restricted its use in applications such as engi...

This chapter demonstrates that several coating systems can be used to provide improved corrosion protection of (AI, Mg, Ti) alloys. The current coating schemes are complex, multilayer systems that incorporate many different technologies and must be conducted very carefully in order to adequately protect light weight metals from corrosion in harsh...

In the plasma electrolytic oxidation (PEO) coating of light metal alloys, changing the electrical parameters and electrolytic composition can change the discharge behaviour and, ultimately, the thickness, surface morphology and porosity of the coating. In the present study a combination of cathodic and anodic current pulses with suitable Ton and To...

Magnesium alloys are especially attractive from a weight reduction point of view. However, the application of magnesium alloys in particular, and to some extent aluminum alloys, has been limited by their susceptibility to corrosion and inferior wear performance. Plasma Electrolytic Oxidation (PEO), also known as Micro-Arc Oxidation (MAO), is a high...

Magnesium alloys are considered one of the more promising materials for future use in many engineering applications. However, due to their high chemical and electrochemical reactivity, magnesium alloys have poor corrosion resistance in aqueous environments. Improving their corrosion resistance by coating can greatly extend their application. One pr...

To further our understanding of the plasma electrolytic oxidation (PEO) process, and to aid in the optimization of the process, it is important to identify the mechanisms of coating formation. In the present work, coatings up to 110 mu m thick were produced on an AJ62 Mg-alloy substrate using the PEO process. Optical emission spectroscopy (OES) was...

The application of magnesium alloys in the automotive and aerospace industry has been limited by their inferior corrosion and wear properties. Therefore, magnesium requires surface modification using protective coatings to obtain adequate resistance to corrosion and wear. Plasma electrolytic oxidation (PEO), which is an electrochemical process that...

This was a poster presentation. See full abstract for details

Magnesium alloys are widely used in the automotive, aerospace, electronics and sports/leisure equipment industries because of their excellent physical and mechanical properties including low density and high strength -to-weight ratio. However, magnesium is a highly reactive metal and requires surface modification using protective coatings to obtain...

The application of magnesium alloys in the automotive industry has been limited by their inferior corrosion and wear properties. PEO (plasma electrolytic oxidation) is an electrochemical process that uses a non-hazardous aqueous electrolyte to oxidize the metal surfaces to form oxide coatings which impart high corrosion and wear resistance. In this...

A promising approach to produce high-quality oxide coatings with good corrosion and wear resistance on magnesium alloys is to use the plasma electrolytic oxidation (PEO) process. The corrosion resistance of PEO coatings, in any particular environment, is dependent on material parameters such as substrate metallurgy and composition of the electrolyt...

Plasma electrolytic oxidation (PEO) is an electrochemical process uses an environmentally-friendly aqueous electrolyte to oxidize the metal surfaces to form ceramic oxide coatings which impart a high corrosion and wear resistance. In this study we investigated the effect of current mode on the properties of PEO coatings formed on an AM60B magnesium...

In this study, we have used PEO (plasma electrolytic oxidation) for the production of oxide coatings on a Ti–6Al–4V alloy at two different current modes, namely pulsed unipolar and bipolar. Optical emission spectroscopy (OES) in the visible and near UV band (280–800 nm) was used to characterize the PEO plasma. The emission spectra were recorded and...

Aromatic imines based on polyanilines have shown exceptional properties in corrosion inhibiting coatings and as organic semiconductor materials. A range of diimines have been prepared by TiCl4 catalyzed condensations of anthraquinone with electron rich and deficient aniline derivatives. Redox potentials, corrosion inhibitions were studied by cyclic...

In situ formation of ceramic coatings on 2024 Al alloy with a blue color was successfully achieved using a plasma electrolytic oxidation process working at atmospheric pressure. This novel blue ceramic coating overcomes the shortcomings of surface treatments resulting from conventional dyeing processes by depositing organic dyes into the porous str...

Magnesium alloys are increasingly being used as lightweight materials in the automotive, defense, electronics, biomaterial and aerospace industries. However, their inherently poor corrosion and wear resistance have, so far, limited their application. Plasma electrolytic oxidation (PEO) in an environmentally friendly aluminates electrolyte has been...

Magnesium alloys are increasingly being used as lightweight materials in automotive and aerospace vehicles. The desired characteristics of these magnesium alloys are an optimal combination of low-cost castability creep resistance tensile strength and corrosion resistance. The magnesium-aluminium- strontium AJ62 alloy is a die castable alloy that ha...

In their search for improved performance - together with increased fuel economy and reduced emissions - the automotive industry is making increased use of light metal alloy materials including aluminum and magnesium alloys. Magnesium alloys are especially attractive from a weight reduction point of view because of their very low specific gravity (∼...

In this study, a plasma electrolytic oxidation process (PEO) was used to produce oxide coatings on commercially pure aluminum (Al 1100) at two different current modes, pulsed unipolar and bipolar modes. Optical emission spectroscopy (OES) in the visible and near ultraviolet (NUV) band (285nm–800nm) was employed to investigate the PEO plasma. The em...

Aluminum-made settings are widely used in healthcare, schools, public facilities and transit systems. Frequently-touched surfaces of those settings are likely to harbour bacteria and be a potential source of infection. One method to utilize the effectiveness of copper (Cu) in eliminating pathogens for these surfaces would be to coat the aluminum (A...

In this study, aluminum oxide was deposited on an Al alloy substrate to produce hard ceramic coatings using a plasma electrolytic oxidation (PEO) process working at atmospheric pressure. The process utilizes dc and unipolar pulsed dc in the frequency range 0.2–20 kHz. Optical emission spectroscopy was employed to study the species and electron temp...

In this study, a plasma electrolytic oxidation (PEO) process was used to produce oxide coatings on commercially pure aluminium (1100 alloy) at a pulsed dc power mode. The effects of process parameters (i.e. current density and treatment time) on the plasma discharge behaviour during the PEO treatment were investigated using optical emission spectro...

In this study, aluminum oxide was deposited on a pure aluminum substrate to produce hard ceramic coatings using a Plasma Electrolytic Oxidation (PEO) process. The process utilized DC, unipolar pulsed DC in the frequency range (0.2 KHz -- 20 KHz) and bipolar pulsed DC current modes. The effects of process parameters (i.e., electrolyte concentration,...