scholarly journals PERILAKU KOROSI MATERIAL GELAS METALIK BERBASIS ZIRKONIUM UNTUK MATERIAL IMPLAN

2011 ◽  
Vol 15 (1) ◽  
pp. 234
Author(s):  
Djony Izak Rudyardjo
Keyword(s):  
Corrosion Rate ◽  
Metallic Glasses ◽  
Alloy Element ◽  
Corrosion Process ◽  
Nacl Solution ◽  
Corrosion Resistant ◽  
Corrosion Rates ◽  
Implant Material ◽  
Corrosion Reaction ◽  
Back Ground

PERILAKU KOROSI MATERIAL GELAS METALIK BERBASIS ZIRKONIUM UNTUK MATERIAL IMPLAN Djony Izak Rudyardjo1) 1)Departemen Fisika FST Universitas Airlangga, Kampus C Jl. Mulyorejo, Surabaya ABSTRAK Penelitian ini bertujuan untuk mempelajari perilaku korosi, pengaruh variasi komposisi paduan dan variasi konsentrasi larutan NaCl terhadap nilai laju korosi material gelas metalik yang berbasis zirkonium, dan untuk mengetahui potensi material gelas metalik berbasis zirkonium untuk material implan. Hasil uji XRD menunjukkan pola difraksi hanya merupakan cacah latar. Selanjutnya, laju korosi 0,36% NaCl pada variasi campuran elemen Zr67Cu33, Zr69.5Cu12Ni11Al7.5, Zr70Ni15Al15 dan   Zr67,6Cu11,8Ni10,8Al7,8Si2 berturut-turut adalah  17,7324 mpy; 13,5916 mpy; 7,1273 mpy da 5.8582 mpy.   Variasi campuran elemen mempengaruhi laju korosi dan Zr67,6Cu11,8Ni10,8Al7,8Si2 mempunyai daya  tahan korosi yang baik, karena adanya elemen Ni dan Si yang membuat reaksi korosi menjadi lambat. Hasil uji korosi pada sampel Zr69.5Cu12Ni11Al7.5 dengan variasi konsentrasi larutan NaCl 0,355%; 0,362%; 0,369% dan 0,376%   berturut-turut adalah 12,0732 mpy; 13,5916 mpy; 19,6227 mpy dan  28.1623 mpy.  Hasilnya menunjukkan laju korosi cenderung meningkat dengan peningkatan konsentrasi larutan NaCl. Dari penelitian ini dapat disimpulkan bahwa zirkonium berbasis gelas metalik mempunyai potensi untuk material implan. Hal ini sesuai dengan salah satu syarat untuk material implan, yaitu harus mempunyai daya tahan korosi yang tinggi, sehingga kinerjanya sebagai material implan tidak membahayakan tubuh. Kata kunci:  gelas metalik, korosi, material implan   THE BEHAVIOR OF ZIRCONIUM-BASED METALLIC GLASSES FOR IMPLANT MATERIALSABSTRACT The aim of this research was to study the corrosion behavior, the effects of composition and concentration variation of NaCl solution on corrosion rate of zirconium-based metallic glasses, and to ecaluate the potential of this glasses for implant material. The result of XRD test showed that the diffraction pattern was only the back ground.  Furthermore, corrosion rates of alloy elements Zr67Cu33, Zr69.5Cu12Ni11Al7.5, Zr70Ni15Al15 and Zr67,6Cu11,8Ni10,8Al7,8Si2 in 0,36% NaCl were 17,7324 mpy; 13,5916 mpy; 7,1273 mpy and 5.8582 mpy, respectively.  Variation of alloy element affected the corrosion rate.  Zr67,6Cu11,8Ni10,8Al7,8Si2 had the best corrosion resistant because of  the present of Ni and Si, so that the corrosion reaction occured slower. The corrosion rate of corrosion test on Zr69.5Cu12Ni11Al7.5 in 0,355, 0,362, 0,369 and 0,376% NaCl were  12,0732 mpy, 13,5916 mpy, 19,6227 mpy and 28’1623 mpy respectively.  The results indicated that increasing the concentration of  NaCl solution tended to increase the corrosion rate.  It could be concluded that zirconium-based metallic glasses has potential for implant material.  As this material  had the higest, it was suitable for implant material  and it did not andanger our body due to corrosion process. Keywords: metallic glasses, corrosion, implant materials

scholarly journals The Corrosion Behavior of Sputter-Deposited Nanocrystalline W-Cr Alloys in Nacl and NaohaSolutions

1970 ◽  
Vol 25 ◽  
pp. 53-61
Author(s):  
Minu Basnet ◽  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Chromium Content ◽  
Open Circuit ◽  
Nacl Solution ◽  
Corrosion Rates ◽  
Naoh Solution ◽  
Order Of Magnitude ◽  
Sputter Deposited

The corrosion behavior of the sputter-deposited nanocrystalline W-Cr alloys wasstudied in 0.5 M NaCl and alkaline 1 M NaOH solutions at 25°C, open to air usingimmersion tests and electrochemical measurements. Chromium metal acts synergisticallywith tungsten in enhancing the corrosion resistance of the sputter-deposited W-Cr alloys soas to show higher corrosion resistance than those of alloy-constituting elements in both 0.5M NaCl and 1 M NaOH solutions. In particular, the nanocrystalline W-Cr alloys containing25-91 at% chromium showed about one order of magnitude lower corrosion rates (that is,about 1-2 × 10-3 mm.y-1) than those of tungsten and chromium metals even for prolongedimmersion in 0.5 M NaCl solution at 25°C. On the other hand, the corrosion rate of thesputter-deposited W-Cr alloys containing 25-75 at % chromium was decreased significantlywith increasing chromium content and showed lowest corrosion rates (that is, 1.5-2.0 × 10-3 mm.y-1) after immersed for prolonged immersion in 1 M NaOH solution. The corrosion ratesof these nanocrystalline W-(25-75)Cr alloys are nearly two orders of magnitude lower thanthat of tungsten and more than one order of magnitude lower corrosion rate than that ofsputter-deposited chromium metal in 1 M NaOH solution. The corrosion-resistant of all theexamined sputter-deposited W-Cr alloys in 0.5 M NaCl solution is higher than in alkaline 1M NaOH solution at 25°C. Open circuit potentials of all the examined W-Cr alloys areshifted to more noble direction with increasing the chromium content in the alloys afterimmersion for 72 h in both 0.5 M NaCl and 1 M NaOH solutions at 25°C, open to air.Keywords: Sputter deposition, nanocrystalline W-Cr alloys, corrosion test, electrochemicalmeasurement, NaCl and NaOH solutions.DOI:  10.3126/jncs.v25i0.3300Journal of Nepal Chemical Society Volume 25, 2010 pp 53-61

Effect of heat treatment on microstructure and corrosion resistance of extruded ZK80 Mg alloy

2019 ◽  
Vol 9 (9) ◽  
pp. 1092-1099
Author(s):  
Fenghong Cao ◽  
Chang Chen ◽  
Zhenyu Wang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Aging Time ◽  
Room Temperature ◽  
Aging Treatment ◽  
Corrosion Process ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Corrosion Properties

The corrosion characteristics and corrosion mechanism of the extruded ZK80 alloy with different states soaking in 3.5% NaCl solution at room temperature were analyzed via OM, SEM, EDS, XRD and static weightlessness method and other experimental analysis methods. The results show that when the aging temperature is constant, and the corrosion rate decreases with the lengthen of aging time, while when the corrosion time is constant, the corrosion rate increases with the increase in aging time. Appropriate aging treatment not only refines the grain of the alloy, but also precipitates the Mg–Zn phase which can effectively prevent the corrosion process and improve the anti-corrosion properties of the alloy. The main corrosion characteristics of the alloy are filamentary corrosion and pitting corrosion.

scholarly journals Effect of Microstructure on Corrosion Behavior of WE43 Magnesium Alloy in As Cast and Heat-Treated Conditions

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1552
Author(s):  
Chenxi Yang ◽  
Nikhil Gupta ◽  
Hanlin Ding ◽  
Chongchen Xiang
Keyword(s):  
Heat Treatment ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Immersion Test ◽  
Adjacent Area ◽  
Protective Film ◽  
Nacl Solution ◽  
Rich Phase ◽  
Corrosion Reaction ◽  
Heat Treated

The improvement in corrosion resistance of WE43 was well realized by heat treatment. To study the influence of microstructure on the corrosion behavior of WE43 in as-cast and heat-treated conditions, an immersion test was employed with as-cast and heat-treated samples in the 3.5% NaCl solution. The corrosion rate and change of morphology were recorded and the corrosion behavior was further investigated by scanning electron microscopy (SEM). The results indicated that the corrosion rate of the WE43 alloy decreased after heat treatment. It was observed that the eutectic gradually damages the protective film on the surface of the as-cast WE43 in the process of corrosion, which further increases the corrosion rate. The Zr-rich phase formed a domed structure resulting in the adjacent area being further corroded. The Y-rich phase has little effect on the corrosion reaction.

ZnO Nanoparticles for Anti-Corrosion Nanocoating of Carbon Steel

2017 ◽  
Vol 894 ◽  
pp. 76-80 ◽  
Author(s):  
J.N. Hasnidawani ◽  
Noor Azlina Hassan ◽  
Hassan Norita ◽  
Noorasikin Samat ◽  
Noor Najmi Bonnia ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Behaviour ◽  
Oxide Coating ◽  
Immersion Test ◽  
Nacl Solution ◽  
Corrosion Resistant ◽  
Naoh Solution

Nanostructured coatings offer great potential for various applications due to their superior characteristics that are not typically found in conventional coatings. This research aimed at developing a new and improved coating that employs zinc oxide nanopowder as the agent to achieve corrosion resistant properties for a coating. The research project discusses on its corrosion behaviour of epoxy-zinc oxide in different media by measuring its corrosion rate. Mild carbon steel was used as the substrate for the epoxy-zinc oxide coating. The corrosion behavior mechanism of mild steel was investigated in different media, namely fresh water, NaCl solution, HCl solution and NaOH solution. Immersion test was conducted and studied for a period of 60 days, with daily and weekly weighing and immersing. The corrosion rate was calculated and mild steel corrodes in the different environment and degrades in the following trend; HCl → NaCl → NaOH → H2O.

The Corrosion Resistance of the Mg-Al-Ca-Sr Sand Casting Magnesium Alloys

2012 ◽  
Vol 326-328 ◽  
pp. 255-260 ◽  
Author(s):  
Andrzej Kiełbus ◽  
Tomasz Rzychoń ◽  
Joanna Michalska ◽  
Michal Stopyra
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Immersion Test ◽  
Corrosion Layer ◽  
Sand Casting ◽  
Nacl Solution ◽  
Effective Barrier ◽  
Corrosion Rates

In this paper, the corrosion resistance of two sand-casting creep resistant magnesium alloys Mg-9Al-1.5Ca-0.3Sr and Mg-9Al-2.2Ca-0.8Sr in the salt environment has been investigated. Specimens of each alloy has been immersed in 3.5% NaCl solution at room temperature and successively taken out after 1, 2, 4, 5 and 9 days. After immersion test, the microstructure and the appearances of the corroded structure were examined. The corrosion rates of both investigated alloys increased lineally with increasing the exposure time in both solutions. Mg-9Al-1.5Ca-0.3Sr alloy exhibits the higher corrosion rate during the immersion test than Mg-9Al-2.2Ca-0.8Sr. The corrosion layer of both alloys consists of MgO, MgOH and phases containing Cl, Na, Al and Ca. The increase of Ca content in the Mg-9Al-2.2Ca-0.8Sr alloy improved the corrosion resistance due to the formation of the reticular (Mg,Al)2Ca phase, which acted as an effective barrier against corrosion.

Corrosion Rates and Mechanical Properties of Rebar HRB400

2014 ◽  
Vol 953-954 ◽  
pp. 1492-1495
Author(s):  
Ping Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Nacl Solution ◽  
Corrosion Rates ◽  
Before And After ◽  
Corrosion Time

The corrosion rates of rebar HRB400 in 0.5 wt.% NaCl solution were measured, and the mechanical properties before and after corrosion were tested. The results showed that, with the increase of corrosion time, the corrosion rate of rebar HRB400 increases and the corrosion becomes heavier. Meanwhile, the yield strength and tensile strength decrease, but the elongation decreases at first and then increases.

Effects of Fluoride and other Anions on the Corrosion of Alloy 22

2002 ◽  
Vol 757 ◽  
Author(s):  
A. L. Pulvirenti ◽  
K. M. Needham ◽  
M. A. Adel-Hadadi ◽  
A. Barkatt ◽  
C. R. Marks ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Phosphoric Acid ◽  
Corrosion Inhibitor ◽  
General Corrosion ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Corrosion Rates ◽  
Reducing Conditions ◽  
Constant Ph ◽  
Alloy 22

ABSTRACTSamples of Alloy 22 were tested in solutions containing various anions in order to determine their effect on the corrosion of the alloy. It was found that Alloy 22 is relatively corrosion resistant in HCl and HNO3 at pH 1 and 160°C (general corrosion rates on the order of 10 μm/year), but more susceptible to phosphoric acid, especially under reducing conditions. The presence of fluoride raised the corrosion rate of Alloy 22 to the order 1 mm/year at pH 1, and fluoride is still active towards Alloy 22 at pH levels as high as 3.5. Samples tested in solutions of 1000xJ13 in which the pH was altered during testing showed an increase in corrosion rate over solutions of constant pH. Preliminary electrochemical tests suggest that nitrate may be an effective corrosion inhibitor in fluoride containing solutions, while sulfate is not.

scholarly journals The Corrosion Behavior of Sputter-deposited W-Ti Alloys in 0.5 M NaCl Solution

1970 ◽  
Vol 10 ◽  
pp. 109-113 ◽  
Author(s):  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Open Circuit ◽  
Nacl Solution ◽  
Corrosion Resistant ◽  
Corrosion Rates ◽  
Ti Alloys ◽  
Confocal Scanning ◽  
Confocal Scanning Laser ◽  
Sputter Deposited

The corrosion behavior of the sputter-deposited amorphous or nanocrystalline W-Ti alloys was studied in neutral 0.5 MNaCl solution at 25°C, open to air by immersion tests, electrochemical measurements and confocal scanning laser microscopic(CSLM) techniques. Titanium metal acts synergistically with tungsten in enhancing the corrosion resistance of the sputter-deposited W-Ti alloys so as to show higher corrosion resistance than those of alloy-constituting elements (that is, tungsten and titanium) in neutral 0.5 M NaCl solution. In particular, the amorphous W-Ti alloys containing 30-53 at% titanium showed lowest corrosion rates (that is, about 1 × 10-3 mm.y-1). Open circuit potentials of all the examined W-Ti alloys were shifted to more noble direction than those of the open circuit potentials of alloyconstituting elements in 0.5 M NaCl solution.Key words: Sputter deposition; W-Ti alloys; Corrosion-resistant; CSLM; NaCl solution.DOI: 10.3126/njst.v10i0.2899Nepal Journal of Science and Technology Volume 10, 2009 December Page:109-113 

scholarly journals Copper, Iron, and Aluminium Electrochemical Corrosion Rate Dependence on Temperature

2021 ◽  
Author(s):  
Mykhaylo Viktorovych Yarmolenko
Keyword(s):  
Experimental Data ◽  
Corrosion Rate ◽  
Room Temperature ◽  
Electronic Device ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
Corrosion Rates ◽  
Dislocation Pipe ◽  
And Diffusion ◽  
Diffusion Activation

Our investigations show that electrochemical corrosion of copper is faster than electrochemical corrosion of aluminium at temperatures below 100°C. Literature data analysis shows that the Al atoms diffuse faster than the Cu atoms at temperatures higher than 475°C, Al-rich intermetallic compounds (IMCs) are formed faster in the Cu-Al system, and the Kirkendall plane shifts towards the Al side. Electrochemical corrosion occurs due to electric current and diffusion. An electronic device working time, for example, depends on the initial copper cover thickness on the aluminium wire, connected to the electronic device, temperature, and volume and dislocation pipe diffusion coefficients, so copper, iron, and aluminium electrochemical corrosion rates are investigated experimentally at room temperature and at temperature 100°C. Intrinsic diffusivities ratios of copper and aluminium at different temperatures and diffusion activation energies in the Cu-Al system are calculated by the proposed methods here using literature experimental data. Dislocation pipe and volume diffusion activation energies of pure iron are calculated separately by earlier proposed methods using literature experimental data. Aluminium dissolved into NaCl solution as the Al3+ ions at room temperature and at temperature 100°C, iron dissolved into NaCl solution as the Fe2+ (not Fe3+) ions at room temperature and at temperature 100°C, copper dissolved into NaCl solution as the Cu+ ions at room temperature, and as the Cu+ and the Cu2+ ions at temperature 100°C. It is found experimentally that copper corrosion is higher than aluminium corrosion, and the ratio of electrochemical corrosion rates, kCu/kAl > 1, decreases with temperature increasing, although iron electrochemical corrosion rate does not depend on temperature below 100°C. It is obvious because the melting point of iron is higher than the melting point of copper or aluminium. It is calculated that copper electrochemical corrosion rate is approximately equal to aluminium electrochemical corrosion at a temperature of about 300°C, so the copper can dissolve into NaCl solution mostly as the Cu2+ ions at a temperature of about 300°C. The ratio of intrinsic diffusivities, DCu/DAl < 1, increases with temperature increasing, and intrinsic diffusivity of aluminium could be approximately equal to intrinsic diffusivity of copper at a temperature of about 460°C.

Corrosion Rates of Mild Steel In NH4NO3-NH3-H2O Solutions★

CORROSION ◽  
1958 ◽  
Vol 14 (4) ◽  
pp. 57-59 ◽  
Author(s):  
NORMAN HACKERMAN ◽  
RAY M. HURD ◽  
EARL S. SNAVELY
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Sodium Arsenite ◽  
Reference Electrode ◽  
Effective Inhibitor ◽  
Corrosion Rates ◽  
Corrosion Reaction ◽  
Simple Potential

Abstract Corrosion rates of mild steel in mixtures of NH4NO3-NH3-H2O were measured at temperatures of 30, 45 and 60 C. The effects of various sulfur and arsenic-containing inhibitors were studied, with particular emphasis on NH4CNS. The corrosion reaction was found to be markedly affected by stresses in the metal to the extent that completely stress-relieved coupons would not corrode at all. The rate of the uninhibited reaction was much lower at 45 and 60 C than at 30 C, indicating a change in the mechanism of the corrosion reaction. The uninhibited corrosion rate of 3700 mdd at 30 C was decreased to approximately 25 mdd with NH4CNS concentrations greater than 0.1 percent. At 45 C, the most effective inhibitor was found to be 0.05 percent 2-mercapto-ethanol + 0.05 percent sodium arsenite, followed closely by 0.1 percent NH4CNS + 0.05 percent sodium arsenite. Thio-cyanate and thiourea alone at concentrations of 0.1 percent were somewhat less effective. Simple potential measurements using a platinum reference electrode showed the corroding coupons to be about 0.9 volt more anodic than the stress-relieved coupons. 4.3.4

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