Perspective on “Corrosion and Passivity of Ti-13% Nb-13% Zr in Comparison to Other Biomedical Implant Alloys,” S.Y. Yu, J.R. Scully, Corrosion 53, 12 (1997): p. 965-976

CORROSION ◽  
10.5006/3628 ◽  
2020 ◽  
Vol 76 (11) ◽  
Author(s):  
Sannakaisa Virtanen
Keyword(s):  
Corrosion Behavior ◽  
Materials Science ◽  
Metals And Alloys ◽  
The Body ◽  
Biodegradable Implants ◽  
Biomedical Implants ◽  
Corrosion Resistant ◽  
Biomedical Implant ◽  
Mechanistic Understanding ◽  
Implant Alloys

Abstract: Corrosion of biomedical implants is a risk for safe applications of metals for healing in the body. Therefore, for implants that are designed to be permanent (in contrast to biodegradable implants), highly corrosion resistant metals and alloys are used—most notably titanium and its alloys. This perspective discusses a paper that reported on the corrosion behavior of a number of Ti-based implant alloys, from a viewpoint of materials science and a detailed mechanistic understanding of passivity.

John Wyrill Christian. 9 April 1926 — 27 February 2001

2008 ◽  
Vol 54 ◽  
pp. 71-94
Author(s):  
George D. W. Smith ◽  
Harshad K. D. H. Bhadeshia
Keyword(s):  
Mechanical Properties ◽  
Phase Transformations ◽  
Materials Science ◽  
Martensitic Transformations ◽  
Metals And Alloys ◽  
The Body ◽  
Physical Metallurgy ◽  
Impurity Effects ◽  
The Subject ◽  
Successive Generations

During a distinguished career, John Wyrill (‘Jack') Christian had a profound impact on the subject of materials science, particularly physical metallurgy. He was recognized as a world authority on martensitic transformations, and laid the foundations forthe modern understanding of this topic. His monumental two–volume work, The theory of phase transformations in metals and alloys , is the classic authoritative treatise on the subject, and remains one of the most important texts ever published in the area of materials science. It redefined the whole field of phase transformations, set new standards of intellectual rigour and comprehensiveness, and inspired successive generations ofscientists to follow in his footsteps. He was also a pioneer in the study of the mechanical properties of metals and alloys, particularly those having the body–centred cubic structure. He and his students played a key role in establishing that the low–temperature mechanical properties ofthis important class of metals are controlled by intrinsic dislocation–lattice interactions and not by impurity effects. He contributed tothe study of many other topics in materials science, including the structure of interfaces, the mechanism of deformation twinning, and the properties of stacking faults. He was the recipient of numerous national and international awards for his work. His researches, which were always characterized by precision and deep physical insight, have stood the test of time.

INFLUENCE OF MICROSTRUCTURE OF AH32 CORROSION RESISTANT STEEL ON CORROSION BEHAVIOR

2013 ◽  
Vol 48 (5) ◽  
pp. 534-540 ◽  
Author(s):  
Xuehui HAO ◽  
Junhua DONG ◽  
Jie WEI ◽  
Wei KE ◽  
Changgang WANG ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Corrosion Resistant Steel ◽  
Resistant Steel ◽  
Corrosion Resistant

scholarly journals Mechanics of the small punch test: a review and qualification of additive manufacturing materials

2021 ◽  
Vol 56 (18) ◽  
pp. 10707-10744
Author(s):  
Jonathan Torres ◽  
Ali P. Gordon
Keyword(s):  
Additive Manufacturing ◽  
Material Properties ◽  
Materials Science ◽  
Contemporary Literature ◽  
The Body ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Testing Data ◽  
The Relationship

AbstractThe small punch test (SPT) was developed for situations where source material is scarce, costly or otherwise difficult to acquire, and has been used for assessing components with variable, location-dependent material properties. Although lacking standardization, the SPT has been employed to assess material properties and verified using traditional testing. Several methods exist for equating SPT results with traditional stress–strain data. There are, however, areas of weakness, such as fracture and fatigue approaches. This document outlines the history and methodologies of SPT, reviewing the body of contemporary literature and presenting relevant findings and formulations for correlating SPT results with conventional tests. Analysis of literature is extended to evaluating the suitability of the SPT for use with additively manufactured (AM) materials. The suitability of this approach is shown through a parametric study using an approximation of the SPT via FEA, varying material properties as would be seen with varying AM process parameters. Equations describing the relationship between SPT results and conventional testing data are presented. Correlation constants dictating these relationships are determined using an accumulation of data from the literature reviewed here, along with novel experimental data. This includes AM materials to assess the fit of these and provide context for a wider view of the methodology and its interest to materials science and additive manufacturing. A case is made for the continued development of the small punch test, identifying strengths and knowledge gaps, showing need for standardization of this simple yet highly versatile method for expediting studies of material properties and optimization.

scholarly journals Fabrication of Superhydrophobic AA5052 Aluminum Alloy Surface with Improved Corrosion Resistance and Self Cleaning Property

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 390 ◽  
Author(s):  
Qian Zhao ◽  
Tiantian Tang ◽  
Fang Wang
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Materials Science ◽  
Composite Coatings ◽  
Alloy Surface ◽  
Corrosion Resistant ◽  
Self Cleaning ◽  
Aa5052 Aluminum Alloy ◽  
Aluminum Alloy Surface

The development of a self-cleaning and corrosion resistant superhydrophobic coating for aluminum alloy surfaces that is durable in aggressive conditions has attracted great interest in materials science. In the present study, a superphydrophobic film was fabricated on an AA5052 aluminum alloy surface by the electrodeposition of Ni–Co alloy coating, followed by modification with 6-(N-allyl-1,1,2,2-tetrahydro-perfluorodecyl) amino-1,3,5-triazine-2,4-dithiol monosodium (AF17N). The surface morphology and characteristics of the composite coatings were investigated by means of scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS), atomic force microscope (AFM) and contact angle (CA). The corrosion resistance of the coatings was assessed by electrochemical tests. The results showed that the surface exhibited excellent superhydrophobicity and self-cleaning performance with a contact angle maintained at 160° after exposed to the atmosphere for 240 days. Moreover, the superhydrophobic coatings significantly improved the corrosion resistant performance of AA5052 aluminum alloy substrate in 3.5 wt.% NaCl solution.

IV. On the expansion by heat of metals and alloys

1867 ◽  
Vol 15 ◽  
pp. 220-222
Keyword(s):  
Specific Gravity ◽  
Metals And Alloys ◽  
The Body ◽  
The Other ◽  
Different Temperatures ◽  
The Mean

In a paper “ On the Expansion by Heat of Water and Mercury” *, a method of determining the expansion of bodies is described, by which good results can be obtained with comparatively small quantities of the substances to be experimented with. This method, that of weighing the body in water at different temperatures, has been employed for the present research. The results obtained are given in the following Tables:— From the above the following conclusion is drawn-namely, that just as it may be said that the specific gravity of an alloy is approximately equal to the mean specific gravities of the component metals , so also from the foregoing we may deduce that the volume which an alloy will occupy at any temperature between 0° and 100° is approximately equal to the mean of the volumes o f the component metals at the same temperature, or, in the other words, the cubical or linear coefficients o f expansion by heat of an alloy between 0° and 100° are approximately equal to the mean of the cubical or linear coefficients of expansion by heat o f the component metals .

scholarly journals Biomaterials in ophthalmology: human cornea bioengineering

2019 ◽  
Vol 1 (1) ◽  
pp. 012-018
Keyword(s):  
Materials Science ◽  
Medical Engineering ◽  
Optical Power ◽  
Synthetic Polymers ◽  
The Body ◽  
Human Cornea ◽  
Natural Polymers ◽  
Innovative Method ◽  
High Elasticity ◽  
Healthcare Practice

Medical engineering, as an auspicious conjunction between healthcare practice, biotechnology and materials science, has emerged over time with the aim to improve human’s health. Cornea, an essential part of the eye responsible for most of its optical power, suffers every day due to accidents or various diseases. To avoid complications and overcome limitations of conventional transplantation and other surgical procedures, biomaterials and bioprinting proved beneficial can be used to design optimal devices for corneal implantation. During medical evolution, biopolymers have been used especially in tissue engineering applications, due to their high elasticity and flexibility, adaptable optical properties and tunable microstructure. Natural polymers are well accepted by the body, their offer support for tissue regeneration and, in most cases, they are easy to obtain. Beside natural-derived biopolymers, synthetic polymers can be used in bioprinting to develop performance-enhanced platforms for corneal bioengineering. Bioprinting represents an innovative method to obtain a corneal implant and has the advantage to enable the facile control over some specific properties, such as thickness, color, elasticity or shape.

Electrochemical Corrosion Behavior of Corrosion-Resistant Steel for Cargo Oil Tank

2013 ◽  
Vol 652-654 ◽  
pp. 1876-1880 ◽  
Author(s):  
Jing Xu ◽  
Jian Wei Yang ◽  
Jian Ping Cao
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Corrosion ◽  
Corrosion Resistant Steel ◽  
Resistant Steel ◽  
Corrosion Morphology ◽  
Corrosion Resistant ◽  
Cargo Oil Tank ◽  
Electrochemical Corrosion Behavior ◽  
Oil Tank ◽  
Corrosion Pit

Electrochemical corrosion behavior of corrosion-resistant steel for cargo oil tank were studied under different immersion corrosion time, and tests were carried in the PH=0.85, 10% NaCl solution, which temperature were 30°C. The electrochemical tested by the electrochemical polarization curve and electrochemical impedance spectroscopy (EIS), and the corrosion morphology and distribution of corrosion pit were observed under the metallography. The results indicate that along with the time extending, the corrosion potential of material moved from positive to negative, and then moved to positive. The corrosion current density also first reduced, then followed by the increasing and then decreasing, which indicated that the corrosion products of sample surface experienced a growth - dissolution - growth process, and presented a periodic corrosion rule. The position of corrosion pit mainly occurred around the pearlite.

scholarly journals Corrosion behavior of metals and alloys in marine-industrial environment

2008 ◽  
Vol 9 (4) ◽  
pp. 045002 ◽  
Author(s):  
Mariappan Natesan ◽  
Subbiah Selvaraj ◽  
Tharmakkannu Manickam ◽  
Gopalachari Venkatachari
Keyword(s):  
Corrosion Behavior ◽  
Metals And Alloys ◽  
Industrial Environment

Improvement of corrosion resistance of magnesium alloys for biomedical applications

2015 ◽  
Vol 33 (3-4) ◽  
pp. 101-117 ◽  
Author(s):  
Kai Chen ◽  
Jianwei Dai ◽  
Xiaobo Zhang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Biomedical Applications ◽  
Mg Alloys ◽  
Localized Corrosion ◽  
Biodegradable Implants ◽  
Ordered Structure ◽  
Corrosion Rates ◽  
Long Period ◽  
Treatment Techniques

AbstractIn recent years, magnesium (Mg) alloys have attracted great attention due to superior biocompatibility, biodegradability, and other characteristics important for use in biodegradable implants. However, the development of Mg alloys for clinical application continues to be hindered by high corrosion rates and localized corrosion modes, both of which are detrimental to the mechanical integrity of a load-bearing temporary implant. To overcome these challenges, technologies have been developed to improve the corrosion resistance of Mg alloys, among which surface treatment is the most common way to enhance not only the corrosion resistance, but also the bioactivity of biodegradable Mg alloys. Nevertheless, surface treatments are unable to fundamentally solve the problems of fast corrosion rate and localized corrosion. Therefore, it is of great importance to alter and improve the intrinsic corrosion behavior of Mg alloys for biomedical applications. To show the significance of the intrinsic corrosion resistance of biodegradable Mg alloys and attract much attention on this issue, this article presents a review of the improvements made to enhance intrinsic corrosion resistance of Mg alloys in recent years through the design and preparation of the Mg alloys, including purifying, alloying, grain refinement, and heat treatment techniques. The influence of long-period stacking-ordered structure on corrosion behavior of the biodegradable Mg alloys is also discussed.

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