The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion

2012 ◽  
Vol 538-541 ◽  
pp. 354-358
Author(s):  
Zheng Hua Zheng ◽  
Yong Yao Lv ◽  
Hui Ping Bai
Keyword(s):  
Oxide Layer ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Mixed Oxides ◽  
Oxide Scales ◽  
Nacl Solution ◽  
High Corrosion Resistance ◽  
Internal Oxide ◽  
Edx Analyses ◽  
Sputter Deposited

The rehealing ability of the oxide scales on sputter-deposited Ni-based K52 nanocrystalline coatings after pitting corrosion had been studied by polarization curves in 3.5% NaCl solution. The results indicated that the oxide scales formed on the nano-coatings exhibited excellent rehealing ability after pitting corrosion, and the rehealing oxide scales still had high corrosion resistance. The rehealing ability was declined with longer immersion time in the chloride solution. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides. The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr2O3 and TiO2 and the internal oxide layer was Al2O3.

The Electrochemical Behavior of the Rehealing Oxide Scales After Pitting Corrosion

2012 ◽  
Vol 476-478 ◽  
pp. 1399-1402
Author(s):  
Hui Ping Bai ◽  
Fu Hui Wang ◽  
Yuan Qiang Tu
Keyword(s):  
Corrosion Resistance ◽  
Oxide Layer ◽  
Pitting Corrosion ◽  
Mixed Oxides ◽  
Electrochemical Behaviour ◽  
Oxide Scales ◽  
Internal Oxide ◽  
Excellent Corrosion Resistance ◽  
Nano Coating ◽  
Edx Analyses

The electrochemical behaviour of the rehealing oxide scales on the K52 nanocrystalline coatings had been studied by polarization curves. The results indicated that the oxide scales formed on the nano-coating exhibited rehealing ability after pitting corrosion, and the coating still had excellent corrosion resistance. The rehealing ability was enhanced with prolonged re-oxidation time. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides (Cr2O3, Al2O3 and TiO2). The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr2O3 and TiO2 and the internal oxide layer was Al2O3.

scholarly journals Impediment of Iron Corrosion by N,N′-bis[2-hydroxynaphthylidene]amino]oxamide in 3.5% NaCl Solution

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1263
Author(s):  
El-Sayed M. Sherif ◽  
Ayman H. Ahmed ◽  
Hany S. Abdo ◽  
Monerah N. DefAllah
Keyword(s):  
Pitting Corrosion ◽  
Chloride Solution ◽  
Electrochemical Impedance ◽  
Nacl Solution ◽  
Iron Corrosion ◽  
X Ray ◽  
Iron Sample ◽  
Cyclic Potentiodynamic Polarization ◽  
Assessment Techniques ◽  
Corrosion Of Iron

Hydrazone [N,N′-bis[2-hydroxynaphthylidene]amino]oxamide] derived from the condensation of ethanedihydrazide with 2-hydroxynaphthalene-1-carbaldehyde was synthesized and assessed on the basis of elemental analysis (CHN) and spectral (IR, mass, 13C/1H NMR and UV-Vis) measurements. The influence of N,N-bis([2-hydroxynaphthylidene]amino)oxamide (HAO) in terms of the inhibition of iron corrosion in concentrated sodium chloride solution (3.5 wt.% NaCl) after various exposure periods was assessed. Numerous electrochemical and spectroscopic assessment techniques were performed. Cyclic potentiodynamic polarization experiments indicated that the presence of HAO and its increased concentration decreased the corrosion of iron in NaCl solution by decreasing the corrosion values, anodic and cathodic currents, and corrosion rate. The electrochemical impedance spectroscopy results showed that HAO molecules greatly increased the corrosion resistance. The chronoamperometric experiments performed at −475 mV (Ag/AgCl) revealed that the HAO molecules decreased the absolute currents and reduced the probability of the occurrence of pitting corrosion. The effect of HAO on the inhibition of iron corrosion was also confirmed through scanning electron microscopy micrographs and energy-dispersive X-ray profile analyses, which proved that the surface of the iron sample exposed to chloride solution alone was pitted, while the presence of HAO molecules reduced the severity of the pitting corrosion. The results confirmed that the presence of HAO molecules inhibits the corrosion of iron and this impact increased when the exposure time was increased to 48 h.

Intermetallic Particles-Induced Pitting Corrosion in 6061-T651 Aluminium Alloy

2011 ◽  
Vol 690 ◽  
pp. 389-392 ◽  
Author(s):  
Kalenda Mutombo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminium Alloy ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Nacl Solution ◽  
X Ray ◽  
Intermetallic Particles ◽  
The Matrix ◽  
Scanning Electron

The polished 6061-T651 aluminium alloy was immersed in 3.5% NaCl solution with about 7 ppm dissolved oxygen. Scanning Electron Microscopy equipped with Energy dispersive X-ray Spectroscopy revealed the presence of Al-Si-Fe-containing particles that acted as cathodic sites and promoted the matrix dissolution. The effect of pH and chloride solution is assessed.

scholarly journals Influence of Pitting Corrosion on TIG Welded Joints of AA2024 Aluminum Alloy Joints

2021 ◽  
Vol 2115 (1) ◽  
pp. 012052
Author(s):  
K N Gunasekaran ◽  
D Balamurugan ◽  
M Babin ◽  
K J Barath Raj ◽  
S Arun
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Corrosion Test ◽  
Solution Treatment ◽  
Inert Gas ◽  
Nacl Solution ◽  
Tungsten Inert Gas Welding ◽  
High Corrosion Resistance ◽  
Ph Values ◽  
Heat Treated

Abstract In this investigation, AA2024 alloy was welded by tungsten inert gas welding. Access the influence of pitting corrosion on TIG weld; the joints were heat-treated after welding with different techniques. Moreover, the corrosion test was carried out with 3.5% NaCl solution under different pH values such as pH:5, pH:7, and pH: 12. From the experimental results, the joint treated with solution treatment with pH: 7 showed high corrosion resistance than its counterparts.

scholarly journals The Corrosion Behavior of Sputter?deposited W?xTa Alloys in 0.5 M NaCl Solution

2013 ◽  
Vol 14 (1) ◽  
pp. 103-108
Author(s):  
Jagadeesh Bhattarai ◽  
Susil Baral
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Open Circuit Potential ◽  
Corrosion Potential ◽  
Open Circuit ◽  
Nacl Solution ◽  
High Corrosion Resistance ◽  
Positive Direction ◽  
Sputter Deposited

The corrosion behavior of the sputter–deposited amorphous and nanocrystalline W–xTa (x = 8–77) alloys was studied in 0.5 M NaCl solution open to air at 25°C using corrosion tests and electrochemical measurements. Tungsten and tantalum metals act synergistically in enhancing the corrosion resistance of the sputter–deposited W–xTa alloys and hence additions of 23 at. % of tantalum or more to the sputter–deposited W–xTa alloys were found to be effective to achieve significantly high corrosion resistance properties of the alloys than those of alloy– constituting elements. In particular, the corrosion rate of the W–60Ta alloy showed the lowest corrosion rate (that is, 2.0×10-3). The open circuit potential of the alloys shifted noble (positive) direction with immersion time. Addition of tantalum metal in W–xTa alloys is effective for ennoblement of the open circuit corrosion potential of the tungsten metal in 0.5 M NaCl solution open to air at 25°C. Nepal Journal of Science and Technology Vol. 14, No. 1 (2013) 103-108 DOI: http://dx.doi.org/10.3126/njst.v14i1.8929

scholarly journals Pitting Corrosion of Inconel 600 in High Temperature Chloride Solution under Controlled Hydrodynamic Conditions

CORROSION ◽  
1985 ◽  
Vol 41 (4) ◽  
pp. 197-204 ◽  
Author(s):  
M. Karaminezhaad-Ranjbar ◽  
J. Mankowski ◽  
D. D. Macdonald
Keyword(s):  
High Temperature ◽  
Flow Velocity ◽  
Channel Flow ◽  
Pitting Corrosion ◽  
Chloride Solution ◽  
Annular Flow ◽  
Hydrodynamic Conditions ◽  
Nacl Solution ◽  
Breakdown Potential ◽  
Inconel 600

Abstract Pitting corrosion of mill annealed Inconel 600 in buffered 0.1M NaCl solution was studied as a function of temperature (25 to 250 C) under well-defined hydrodynamic conditions (flow velocities from 0 to 158 cm/s) in an annular flow channel. Flow velocity had no significant effect on the breakdown potential over the entire temperature range studied, but some influence on the morphology of attack was noted. Temperature was found to be an important parameter, however, in determining the susceptibility of mill annealed Inconel 600 to localized attack in buffered 0.1M NaCl solution.

scholarly journals Effects of Alloying Elements on the Corrosion Behavior of Sputter–deposited Zr–(12–21)Cr–W Alloys in 0.5 M NaCl Solution

1970 ◽  
Vol 25 ◽  
pp. 75-82
Author(s):  
Basu Ram Aryal ◽  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Test ◽  
Open Circuit Potential ◽  
Chemical Society ◽  
Open Circuit ◽  
Sputter Deposition ◽  
Nacl Solution ◽  
Corrosion Rates ◽  
Sputter Deposited ◽  
Stable Passivity ◽  
Zirconium Metal

The synergistic effect of the simultaneous additions of tungsten and zirconium in thesputter-deposited amorphous or nanocrystalline Zr-(12-21)Cr-W alloys is studied in 0.5 MNaCl solution open to air at 25°C using corrosion tests and open circuit potentialmeasurements. Corrosion rates of the sputter-deposited Zr-(12-21)Cr-W alloys containing10-80 at % tungsten (that is, 0.95-1.85 x 10-2 mm.y-1) are more than one order of magnitudelower than that of the sputter-deposited tungsten and even lower than those of zirconium aswell as chromium in 0.5 M NaCl solution. The addition of 8-73 at % zirconium content inthe sputter-deposited binary W-(12-21)Cr alloys seems to be more effective to improve thecorrosion-resistant properties of the sputter-deposited ternary Zr-Cr-W alloys containing12-21 at % chromium in 0.5 M NaCl solution. The sputter-deposited Zr-(17-21)Cr-W alloyscontaining an adequate amounts of zirconium metal showed the more stable passivity andshowed higher corrosion resistance than those of alloy-constituting elements in 0.5 M NaClsolution open to air at 25°C.Keywords: Zr-(12-21)Cr-W alloys, sputter deposition, corrosion test, open circuit potential,0.5 M NaCl.DOI:  10.3126/jncs.v25i0.3305Journal of Nepal Chemical Society Volume 25, 2010 pp 75-82

scholarly journals Structure and Corrosion Behavior of Sputter-Deposited W-Mo Alloys

1970 ◽  
Vol 21 ◽  
pp. 19-25 ◽  
Author(s):  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Resistance ◽  
Magnetron Sputtering ◽  
Corrosion Behavior ◽  
Solid Solutions ◽  
Chemical Society ◽  
High Corrosion Resistance ◽  
Corrosion Rates ◽  
High Corrosion ◽  
Sputter Deposited

Nanocrystalline, single bcc solid solutions of W-Mo alloys have been successfully prepared by D. C. magnetron sputtering in a wide composition. The corrosion behavior of the sputter-deposited W-Mo alloys was studied. The W-Mo alloys showed significantly high corrosion resistance in 12 M HCl at 30o C. Their corrosion rates are about one and half orders of magnitude lower than that of sputter-deposited tungsten and lower than that of the sputter-deposited molybdenum even after prolonged immersion.DOI: 10.3126/jncs.v21i0.217Journal of Nepal Chemical Society Vol.21 2006 pp.19-25

Effect of Cr and Zr Addition on the Corrosion Behaviour of Copper in the Chloride Solution

2011 ◽  
Vol 194-196 ◽  
pp. 1253-1256
Author(s):  
Ya Ni Zhang ◽  
Mao Sheng Zheng ◽  
Jie Wu Zhu
Keyword(s):  
Corrosion Resistance ◽  
Chloride Solution ◽  
Corrosion Behaviour ◽  
Pure Copper ◽  
Base Material ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Zr Addition ◽  
Corrosion Scales ◽  
Better Than

The corrosion behavior of CuCr, CuZr and CuCrZr alloys in NaCl solution is reported in this paper. The corrosion performance has been evaluated in NaCl solution atmosphere. The results show the corrosion resistance of pure copper decrease with the addition of the alloying elements initially. However, in the later exposure stages, the corrosion resistance of CuZr and CuCrZr alloy deteriorates significantly while the corrosion resistance of CuCr alloy is slightly better than that of pure copper. In addition, the results of the electrochemical experiments indicate that the different behavior for the element Cr and Zr in the base material and corrosion scales lead to the change of the corrosion resistance.

On the treatment of infected wounds with 10% sodium chloride solution

1929 ◽  
Vol 25 (5) ◽  
pp. 578-578
Author(s):  
I. Tsimkhes
Keyword(s):  
Sodium Chloride ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Nacl Solution ◽  
Infected Wounds

B. M. Shtark (Zhurn. Sovrem, surgery, century 20, 1929) treated 104 patients with purulent panaritiums, opened acute abscesses and phlegmons, lymphadenitis, mumps, mastitis, etc., treated with 10% NaCl solution

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