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.

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.

Investigation of graphene effect on the anti-corrosion behaviour of polyurethane coatings in sea-water

2019 ◽  
Vol 66 (6) ◽  
pp. 853-860
Author(s):  
Hai Tan ◽  
Deguo Wang ◽  
Yanbao Guo
Keyword(s):  
Carbon Steel ◽  
Oil And Gas ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Renewable Energy Sources ◽  
Corrosion Property ◽  
Gas Reservoirs ◽  
Content Type ◽  
Corrosion Behaviors ◽  
Steel Surfaces

Purpose Abundant oil and gas reservoirs in the deep-water are the valuable non-renewable energy sources. However, sea-water could enhance the corrosion of marine equipment such as submarine pipe trees. Various coatings, for example, polyurethane (PU) coatings are sprayed on the steel surfaces to enhance the anti-corrosion performance. Thus, to improve the anti-corrosion behavior of PU coatings in sea-water is imperative. Design/methodology/approach In this paper, the corrosion behaviors of 4130 carbon steel with and without PU coatings were discussed by electrochemical mean in sea-water. And the graphene additive in different concentrations (0.1, 0.3, 0.6 and 0.9 per cent) were also studied. A series of characterized methods were introduced to identify the anti-corrosion performances of 4130 carbon steel with and without coatings, respectively. Findings The results showed that the anti-corrosion property of 4130 carbon steel can enhance obviously with the PU coatings. The graphene additive can further improve the anti-corrosion behaviour of PU coatings and in the concentration of 0.6 per cent the PU/graphene coatings worked best. Originality/value This is beneficial for enhancing the service life of marine equipment in an eco-friendly method.

scholarly journals Hot Corrosion Behaviour of TiAl with Salt in Artificial Sea-Water

1997 ◽  
Vol 46 (2) ◽  
pp. 83-89 ◽  
Author(s):  
Hidehiko Kamide ◽  
Hideki Kashima
Keyword(s):  
Hot Corrosion ◽  
Sea Water ◽  
Corrosion Behaviour

The effect of alloying and residual elements on the strength and hot ductility of cast cupro-nickel

1980 ◽  
Vol 295 (1413) ◽  
pp. 123-123
Keyword(s):  
Sea Water ◽  
Corrosion Behaviour ◽  
High Strength ◽  
Intermediate Temperature ◽  
Hot Ductility ◽  
Water Cooling ◽  
Cooling Systems ◽  
Corrosion Resistant ◽  
Weld Thermal Cycle ◽  
Residual Elements

A high strength, corrosion resistant cupro-nickel casting alloy having good intermediate temperature ductility and controlled corrosion behaviour has been developed for use in sea water cooling systems. Welding for repair and fabrication may be required with such components and this property is related to hot ductility behaviour. The latter was assessed by using a modified Gleeble apparatus which enabled specimens to experience a simulated weld thermal cycle followed by fracture at a high strain rate during cooling. These alloys usually show a reduced ductility at intermediate temperature (600 °C) associated with intergranular failure.

Degradation of Hybrid Metal Matrix Composites Reinforced with Boron Carbide and Graphite Particles due to Pit Corrosion

2015 ◽  
Vol 813-814 ◽  
pp. 19-24 ◽  
Author(s):  
V.M. Ravindranath ◽  
G.S. Shiva Shankar ◽  
Anup Hanji ◽  
N.G. Siddeshkumar
Keyword(s):  
Boron Carbide ◽  
Metal Matrix ◽  
Sea Water ◽  
Hybrid Composites ◽  
Corrosion Behaviour ◽  
Base Alloy ◽  
Standard Procedure ◽  
Test Material ◽  
Time Interval ◽  
Cyclic Polarization

In the present study, the corrosion behaviour of the Al2219, Boron carbide and Graphite has been investigated. The Aluminium Metal Matrix Hybrid Composites were fabricated by two step stir casting technique. Corrosion tests were carried out with the natural sea water (3.5 wt % NaCl) according to standard procedure. The tests were conducted at room temperature by cyclic polarization technique for a definite time interval. After the test, material loss was calculated by weight loss method. The surface morphology of the specimen before and after corrosion was studied using the optical microscope images. The test result reviles that, the corrosion rate of the composite was greater than the base alloy, but the corrosion of the hybrid composite is the most compared to the alloy and monolithic composite.

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