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J. Haddad

Bio: J. Haddad is an academic researcher from Sami Shamoon College of Engineering. The author has contributed to research in topics: Gear oil & Mineral oil. The author has an hindex of 1, co-authored 1 publications receiving 14 citations.

Papers
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TL;DR: In this paper, the fatigue and mechanochemical behavior of diecast AZ91D and AM50 alloys in air, transmission oil and natural mineral oil at 25°C were studied.
Abstract: The fatigue and mechanochemical behavior of die-cast AZ91D (Mg–9% Al–l% Zn) and AM50 (Mg–5% Al–0.4% Mn) alloys in air, transmission oil and natural mineral oil at 25 °C were studied. New methods were developed in this research in order to achieve better understanding of the mechanochemical effects in Mg alloys during exposure to different oil environments. It is found that the mineral oil environment causes an increase in the lifetime of both alloys in comparison with the gear oil. AM50 alloy shows excellent fatigue lifetime in oil in comparison with other environments. AZ91 shows a significantly higher sensitivity to the environment in comparison with AM50 alloy.

14 citations


Cited by
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Journal ArticleDOI
TL;DR: A review of the available literature on CF of Mg alloys in corrosive environments including simulated-body-fluid (SBF) and the associated fracture mechanism is presented in this paper.

118 citations

01 Jan 2010
TL;DR: In this article, a review about the current research on magnesium/magnesium alloys corrosion in the industry is provided, except for reviewing the kinds of corrosion on galvanic corrosion, stress corrosion, and corrosion fatigue, its corresponding mechanisms are also explained.
Abstract: A review is provided about the current research on magnesium/magnesium alloys corrosion in the industry. Except for reviewing the kinds of corrosion on galvanic corrosion, stress corrosion, and corrosion fatigue, its corresponding mechanisms are also explained, such as the influence of metallurgical factors, and environmental factors. Furthermore, the protection of magnesium/magnesium alloys corrosion is presented, for instance, surface treatment/modification, coating and so on. Also, because the continuing challenges associated with the use of magnesium alloys, more considerations about future applications and research directions are given according to the properties improvement of magnesium alloys for the eco-friendly requirements.

71 citations

Journal ArticleDOI
TL;DR: In this paper, the application of zinc phosphate electrostatic-painting top coating on cold-sprayed AA7075 led to a significant improvement in corrosion-fatigue performance.
Abstract: In this paper, we report the application of zinc phosphate electrostatic-painting top coating on cold sprayed AA7075 leading to a significant improvement in corrosion-fatigue performance. High strength AA7075 powder was sprayed on AZ31B substrate, followed by the application of the top coating. The electrochemical corrosion and corrosion-fatigue tests of the coated and uncoated specimens were performed in 3.5% NaCl solution. Transmission electron microscopy (TEM) analysis showed that a continuous nanolayered mixture of Mg/Al was formed at the cold spray coating/substrate interface leading to high bonding strength. The results showed that the combined coatings improved the corrosion resistance remarkably, and significantly increased the fatigue life, with a fatigue strength of 80 MPa at 107 cycles, as compared to the as-cast specimen. Surface topographic analysis of the corrosion-fatigue-tested specimens demonstrated the presence of deep macro-pits on the cold sprayed AA7075 coating after 3.7 million cycles, while there were no such pits on the top-coated specimens, even after 107 cycles when tested at 30 Hz. The fractographic analysis of the fatigue-fractured specimens showed that the formation of pits allowed the NaCl solution to penetrate in the AZ31B substrate, creating localized corrosion pits resulting in premature failure, which eventually reduced the fatigue life.

21 citations

Journal ArticleDOI
TL;DR: In this paper, an epoxy coating was applied to improve the corrosion fatigue behavior of AZ31 magnesium alloy in 3.5 wt.% Na2SO4 solution and the bonding interface and the fracture surfaces were investigated by scanning electron microscope.

16 citations