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Corrosion Conditions (corrosion + condition)
Selected AbstractsEnvironmental Behavior and Stress Corrosion Characteristics of Nano/Sub-Micron E950 Aluminum Alloy,ADVANCED ENGINEERING MATERIALS, Issue 11 2009Eli Aghion The corrosion performance and stress corrosion resistance of E950 Aluminum alloy with nano/sub-micron structure were evaluated in 3.5% NaCl solution. The results obtained indicated that the corrosion and stress corrosion resistance of E950 alloy were relatively reduced compared to that of the conventional coarse-grained alloy (Al,4.65%Mg). In particular, the inherently improved ultimate tensile strength of E950 alloy was significantly decreased under stress corrosion conditions. [source] Subcritical crack growth behavior of Al2O3 -glass dental compositesJOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 2 2003Qingshan Zhu Abstract The purpose of this study is to investigate the subcritical crack growth (SCG) behavior of alumina-glass dental composites. Alumina-glass composites were fabricated by infiltrating molten glass to porous alumina preforms. Rectangular bars of the composite were subject to dynamic loading in air, with stressing rates ranging from 0.01 MPa/s to 2 MPa/s. The SCG parameter n was determined to be 22.1 for the composite, which is substantially lower than those of high-purity dense alumina. Investigations showed that glass phases are responsible for the low n value as cracks propagate preferentially within glass phases or along the interface between glass phases and alumina phases, due to the fact that glasses are more vulnerable to chemical attacks by water molecules under stress corrosion conditions. The SCG behavior of the infiltration glass was also investigated and the SCG parameter n was determined to be 18.7. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 65B: 233,238, 2003 [source] Effects of Surface Chemistry on the Nanomechanical Properties of Commercial Float GlassJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 3 2010Pavan V. Kolluru Nanoindentation was used to evaluate the mechanical properties of commercial float glass surfaces that were subjected to various surface cleaning treatments and other short-term corrosion conditions. The changes in the plane strain elastic modulus, where ,s and Es are the Poisson ratio and Young modulus of the specimen, respectively) and hardness after exposure to dilute hydrochloric acid (pH 0.9), reverse osmosis water (pH 7.1), and commercial cleaning solutions (pH 9.5) were found to be 0.5%,9% and 2%,35%, respectively. Similarly, weathering in a humid atmosphere and leaching in hot deionized water also had a distinct effect on the measured properties of the float glass surfaces. Moreover, both the surface cleaning treatments and the short-term corrosion exposures affected the tin side of the float glass differently than the air side. This work suggests that many of the discrepancies in the literature on the effect of tin concentration on the nanomechanical properties of float glass surfaces are likely due to variability in the surface cleaning and exposure history of the samples and calibration glasses that have been used. [source] Influence of alloying elements on the structure and corrosion resistance of galvanized coatingsPHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 7 2004G. Vourlias Abstract Carbon steel samples were galvanized by the hot-dip method in zinc baths containing 0.5 or 1 wt% aluminum, copper, tin, nickel, and/or lead. Bath temperature ranged from 450 to 480 °C. The samples were examined using optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The influence of the alloying elements on the formation of the different phases and on the diffusion process is discussed. In order to study the kinetics and the mechanism of corrosion of these materials, corrosion experiments were carried out in a simulated environment of accelerated atmospheric corrosion conditions, for which a special chamber (Salt Spray Chamber , Alternative Climate Test Chamber) of type SC-450 was used. The corroded samples were examined using optical microscopy, SEM and XRD. Chloride and oxide phases, which penetrated the materials to different depths from the surface, were revealed. Finally, useful conclusions were drawn which help to control the factors of the corrosion behavior of the examined materials in a marine atmosphere. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] | ||||||||||