The chloride corrosion behaviour of four orthodontic wires

Almost all orthodontic wires suffer from corrosion as they are intra-orally engaged. This chemical structure alteration appears on the surface of these wires, surface topography can be easily visualised with scanning electron microscope method. The aim of our study was to assess the intraoral corrosion of the retrieved orthodontic Ni-Ti archwires. Archwire retrieval procedure yielded approximately 30 retrieved wires, placed intra-orally for 1-5 months. SEM analysis was performed and surface changes were interpreted. Our SEM results showed, that surface corrosion and pitting can be seen on the surface of retrieved Ni-Ti wires, the depth of corrosion depends on the time wires have been engaged in the oral cavity. With regards of metal liberation consequently surface corrosion, practitioners should be avare of these chemical changes which can affect the resistence of the orthodontic appliance and patient health.

Download Full-text

In vitro chloride corrosion behaviour of Dispersalloy

Journal of Oral Rehabilitation ◽

10.1111/j.1365-2842.1975.tb01524.x ◽

1975 ◽

Vol 2 (2) ◽

pp. 139-144 ◽

Cited By ~ 36

Author(s):

N. K. SARKAR ◽

E. H. GREENER

Keyword(s):

Corrosion Behaviour ◽

Chloride Corrosion

Download Full-text

Corrosion Behaviour of Equipment in High Temperatures and Corrosion Resistant Alloys

Diffusion Foundations ◽

10.4028/www.scientific.net/df.9.111 ◽

2016 ◽

Vol 9 ◽

pp. 111-127

Author(s):

Hisao Fujikawa

Keyword(s):

High Temperature ◽

Corrosion Behaviour ◽

High Temperature Corrosion ◽

Research Data ◽

Future Research ◽

Metal Dusting ◽

Temperature Oxidation ◽

Corrosion Resistant ◽

Chloride Corrosion ◽

Salt Corrosion

Among the high temperature damages, this paper was discussed on the cases in which the materials were damaged mainly by the effect of environmental factors. That is, high temperature oxidation, steam oxidation, molten salt corrosion, high temperature particle erosion and corrosion, high temperature sulfurization, carburizing, metal dusting, nitriding, high temperature chloride corrosion and so on were introduced using my research data. Finally, anticipation to future research of high temperature corrosion was maintained.

Download Full-text

Comparative study on corrosion behaviour of Nitinol and stainless steel orthodontic wires in simulated saliva solution in presence of fluoride ions

Materials Science and Engineering C ◽

10.1016/j.msec.2013.01.026 ◽

2013 ◽

Vol 33 (4) ◽

pp. 2084-2093 ◽

Cited By ~ 22

Author(s):

M. Mirjalili ◽

M. Momeni ◽

N. Ebrahimi ◽

M.H. Moayed

Keyword(s):

Stainless Steel ◽

Comparative Study ◽

Corrosion Behaviour ◽

Orthodontic Wires ◽

Fluoride Ions

Download Full-text

Corrosion Behaviour of Titanium Alloy and Carbon Steel in a High-Temperature, Single and Mixed-Phase, Simulated Geothermal Environment Containing H2S, CO2 and HCl

Corrosion and Materials Degradation ◽

10.3390/cmd2020011 ◽

2021 ◽

Vol 2 (2) ◽

pp. 190-209

Author(s):

Andri Isak Thorhallsson ◽

Sigrun Nanna Karlsdottir

Keyword(s):

Corrosion Resistance ◽

Titanium Alloy ◽

High Temperature ◽

Elevated Temperature ◽

Carbon Steel ◽

Corrosion Behaviour ◽

Corrosion Layer ◽

Good Corrosion Resistance ◽

Chloride Corrosion ◽

Gauge Pressure

The corrosion behaviour of a new titanium-based alloy, with nickel, molybdenum and zirconium as the main alloying elements, was studied in a simulated geothermal environment at various phase conditions of a corrosive fluid. Corrosion testing of carbon steel was also conducted for comparison. Both materials were tested at an elevated temperature between 180 and 350 °C and at a 10 bar gauge pressure in H2O containing HCl, H2S, and CO2 gases with an acidic condensate of pH = 3. The study found that the titanium alloy demonstrated good corrosion resistance in a single- and multiphase geothermal environment. In the testing volume, where the boiling of testing fluid occurred, the carbon steel was prone to localized damage of oxide, sulphide and chloride corrosion products. In the superheated testing volume, a homogeneous oxide corrosion layer was observed on the carbon steel. In the testing volume where condensation of the testing fluid occurred, a sulphide layer with an oxide sublayer was formed on the carbon steel.

Download Full-text

Localized corrosion behaviour in simulated human body fluids of commercial Ni–Ti orthodontic wires

Biomaterials ◽

10.1016/s0142-9612(98)90233-2 ◽

1999 ◽

Vol 20 (8) ◽

pp. 785-792 ◽

Cited By ~ 106

Author(s):

G Rondelli

Keyword(s):

Human Body ◽

Corrosion Behaviour ◽

Body Fluids ◽

Localized Corrosion ◽

Orthodontic Wires

Download Full-text

Evaluation of corrosion behaviour of tantalum coating obtained by low pressure chemical vapor deposition using electrochemical polarization

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:20020079 ◽

2002 ◽

Vol 12 (4) ◽

pp. 69-74 ◽

Cited By ~ 2

Author(s):

A. Levesque ◽

A. Bouteville ◽

H. de Baynast ◽

B. Laveissière

Keyword(s):

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Corrosion Behaviour ◽

Chemical Vapor ◽

Low Pressure ◽

Electrochemical Polarization ◽

Pressure Chemical

Download Full-text

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.3.2020.14.0618 ◽

2020 ◽

Vol 17 (3) ◽

pp. 8206-8213

Author(s):

J. Alias

Keyword(s):

Corrosion Resistance ◽

Powder Metallurgy ◽

Corrosion Behaviour ◽

Corrosion Current ◽

Optical Microscope ◽

High Reactivity ◽

Aluminium Content ◽

Powder Metallurgy Method ◽

X Ray Diffraction ◽

Promising Development

Much research on magnesium (Mg) emphasises creating good corrosion resistance of magnesium, due to its high reactivity in most environments. In this study, powder metallurgy (PM) technique is used to produce Mg samples with a variation of aluminium (Al) composition. The effect of aluminium composition on the microstructure development, including the phase analysis was characterised by optical microscope (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). The mechanical property of Mg sample was performed through Vickers microhardness. The results showed that the addition of aluminium in the synthesised Mg sample formed distribution of Al-rich phases of Mg17Al12, with 50 wt.% of aluminium content in the Mg sample exhibited larger fraction and distribution of Al-rich phases as compared to the 20 wt.% and 10 wt.% of aluminium content. The microhardness values were also increased at 20 wt.% and 50 wt.% of aluminium content, comparable to the standard microhardness value of the annealed Mg. A similar trend in corrosion resistance of the Mg immersed in 3.5 wt.% NaCl solution was observed. The corrosion behaviour was evaluated based on potentiodynamic polarisation behaviour. The corrosion current density, icorr, is observed to decrease with the increase of Al composition in the Mg sample, corresponding to the increase in corrosion resistance due to the formation of aluminium oxide layer on the Al-rich surface that acted as the corrosion barrier. Overall, the inclusion of aluminium in this study demonstrates the promising development of high corrosion resistant Mg alloys.

Download Full-text