scholarly journals Influence of Annealing Treatments on Welded CuNi Sheets on the Corrosion Behaviour in Sea Water

2021 ◽  
Author(s):  
Maria Victoria Biezma ◽  
Paul Linhardt ◽  
Susanne Strobl ◽  
Roland Haubner
Keyword(s):  
Nickel Alloys ◽  
Weld Seam ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Base Material ◽  
Electrochemical Corrosion ◽  
Offshore Platforms ◽  
Metallographic Examination ◽  
Ship Building ◽  
Desalination Plants

AbstractDue to their good corrosion resistance in seawater, tubes, rods, and forgings made from copper-nickel alloys (Cu-Ni) are widely used in ship building, offshore platforms, desalination plants, and numerous other applications. Welding is a major technology for joining this material. Since the microstructures of base material, weld seam, and heat affected zone may be quite different, the consequences with respect to corrosion must be considered. In this study the influence of microstructure on corrosion behaviour was investigated using welded test coupons of CuNi10Fe1.6 Mn, as-welded and after heat-treatment, by metallographic examination and electrochemical corrosion tests in synthetic seawater.

Electrochemical Corrosion Behaviour of ZrN Film in Various Corrosive Fluid

2015 ◽  
Vol 3 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Vishnu R. ◽  
Jiten Das ◽  
S. B. Arya ◽  
Manish Roy
Keyword(s):  
Sea Water ◽  
Corrosion Behaviour ◽  
Water Solution ◽  
Electrochemical Corrosion ◽  
High Hardness ◽  
Corrosion Current ◽  
Plain Carbon Steel ◽  
Open Circuit ◽  
Protective Film ◽  
Hank’S Solution

Recently, ZrN has been attracting interest for its excellent corrosion resistance, biocompatibility, high hardness, good lubricity and ductility. Although tribological study of ZrN coating has been carried out extensively, investigation related to corrosion of ZrN film is limited. In view of this and in view of possible applications of ZrN film in several engineering components, the present investigation has been undertaken to evaluate the corrosion response of ZrN film in seawater solution, Hank's solution, 0.5M H2SO4solution and 0.5M HCl solutions. Towards that purpose, potentiostatic, open circuit potential and potentiodynamic study of ZrN film deposited on plain carbon steel has been carried out in all these solutions. Results indicate that stable protective film is formed on the surface of ZrN coating in all these solution except 0.5M H2SO4 solution. The formation of protective film on ZrN coating is fastest in sea water solution and it is slowest in the Cl¯ ions containing media, 0.5 M HCl. The corrosion current is highest for 0.5M H2SO4 acid solution and least for Hank's solution.

Electrochemical Corrosion Behaviour of Stainless Steels AISI 304 and 316L in Caribbean Sea Water

2015 ◽  
Vol 227 ◽  
pp. 95-98
Author(s):  
D.M. Herrera-Zamora ◽  
Lucien Veleva ◽  
Juan Luis López
Keyword(s):  
Stainless Steels ◽  
Active Sites ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Electrochemical Corrosion ◽  
Stainless Steel Surface ◽  
Logarithmic Scale ◽  
Low Frequencies ◽  
Aisi 304 ◽  
Electrochemical Corrosion Behaviour

AISI 304 and 316L flat samples were exposed during 3 months in Carribean sea water.At the end of the experiment Ecorrof AISI 316L reached one-half the negative potential value than that of AISI 304. The tendencies of Ecorrwere correlated with the pitting corrosion development. They could be considered as a consequence of the opposition between the nucleation of new pits and repassivation of active sites. The analysis of Ecorrfluctuations was carried out with the potential spectral density (PSD)vs.frequency in logarithmic scale. The decrease of the PSD slopes, exponentbvalues, indicated a release of spontaneous energy with the advance of pits formation on the stainless steel surface. The data showed that in the range of low frequencies the process that occurs on both stainless steels surfaces could be considered as fractional Brownian motion, an anti-persistent non-stationary process, while in the range of higher frequencies as fractional Gaussian noise, an persistent stationary.

scholarly journals Influence of Friction Stir Welding on Corrosion Properties of Aw-7020M Alloy in Sea Water

2015 ◽  
Vol 15 (1) ◽  
pp. 7-13 ◽  
Author(s):  
K. Dudzik ◽  
W. Jurczak
Keyword(s):  
Friction Stir Welding ◽  
Impedance Spectroscopy ◽  
Welded Joint ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Base Material ◽  
Electrochemical Corrosion ◽  
Corrosion Properties ◽  
Shipbuilding Industry ◽  
Friction Stir

Abstract Friction Stir Welding (FSW), provides an alternative to MIG and TIG welding methods for joining aluminium alloys. The article presents the results of electrochemical corrosion resistance test of alloy AW- 7020M and its joints welded by FSW. The study was performed using the method of electrochemical impedance spectroscopy (EIS). Impedance spectroscopy studies showed that both, the FSW welded joint and base material AW-7020M has a good resistance to electrochemical corrosion in sea water environment, wherein the welded joint has a higher susceptibility to this type of corrosion. Research has indicated the desirability of applying the FSW method for joining AW-7020M alloy in shipbuilding industry.

The effect of molybdenum on the corrosion behaviour of steel alloy in sea water

Desalination ◽  
1994 ◽  
Vol 97 (1-3) ◽  
pp. 77-86
Author(s):  
A. Al-Arifi ◽  
M.E. El-Dahshan ◽  
M.I. Hazzaa
Keyword(s):  
Sea Water ◽  
Corrosion Behaviour ◽  
Steel Alloy

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.

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