Corrosion Behaviour of Al Alloys in Sea Water

2010 ◽  
Author(s):  
S. R. M. Kamarudin ◽  
M. Daud ◽  
A. Muhamad ◽  
M. S. Sattar ◽  
A. R. Daud ◽  
...  
Keyword(s):  
Sea Water ◽  
Corrosion Behaviour ◽  
Al Alloys

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

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.

Application of Electron Microscopy to Investigation of Corrosion of Mg-Al Alloys in Various Electrolyte Solutions

2015 ◽  
Vol 231 ◽  
pp. 41-47
Author(s):  
Bartosz Chmiela ◽  
Adrian Mościcki ◽  
Maria Sozańska
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Pressure ◽  
Corrosion Behaviour ◽  
Intermetallic Phase ◽  
Electrolyte Solutions ◽  
Magnesium Hydride ◽  
Al Alloys ◽  
Az91 Alloy ◽  
Nacl Solution ◽  
Hydrogen Trap

The Mg-Al alloys are the best-known and most commonly used magnesium alloys (especially AZ91 alloy). However, the AZ91 alloy offers insufficient corrosion resistance. Many investigations show that hydrogen is the main corrosive factor appearing during chemical reactions between magnesium and water in electrolyte solution. The main intermetallic phase in the AZ91alloy is the Mg17Al12 (β phase), which is a hydrogen trap. During corrosion, magnesium hydride forms inside the β phase, and this phase is brittle fractured when the inner stress caused by hydrogen pressure and expansion stress due to the formation of magnesium hydride is higher thanthe fracture strength. We examined the corrosion behaviour of AZ91 and AE44 magnesium alloysin 0.1M Na2SO4 solution and 3.5% NaCl solution. We analysed two Mg-Al alloys in order todetermine the various effects of hydrogen on these materials.

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.

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