Research on Corrosion-Resistance of High Velocity Arc Spray Coatings on Surface of Steel Structure in Splash Zone Environment

2011 ◽  
Vol 675-677 ◽  
pp. 1291-1294 ◽  
Author(s):  
Shi Cheng Wei ◽  
Bin Shi Xu ◽  
Xiu Bing Liang ◽  
Yu Jiang Wang ◽  
Yi Liu
Keyword(s):  
High Velocity ◽  
Steel Structure ◽  
Steel Structures ◽  
Arc Spraying ◽  
Splash Zone ◽  
Factors Affecting ◽  
Spray Coatings ◽  
Arc Spray ◽  
Before And After ◽  
Corrosion Behaviors

The most severe corrosion of offshore steel structure occurs in splash zone. There are many factors affecting the steel structure corrosion in the splash zone, such as corrosion problems caused by seawater and effect of impacted brought by the ocean wave. Considering the corrosion characteristics in splash zone and the corrosion invalidity behaviors of offshore steel structure, the Zn-15Al, Al-RE, Zn-Al-Mg-RE and FeBSiNb uncrystal coatings were prepared by automatic high velocity arc spraying. The different anti-corrosion behaviors of the four coatings were studied through the corrosion comparative tests and the microstructures analyzed of the coatings before and after the corrosion tests. The anti-corrosion coating systems suitable for using on surface of steel structure corrosion in the splash zone were found, which provided technique guarantee for extending the using life of offshore steel structures.

Thermally Sprayed Composite Coatings for Enhanced Corrosion Protection of Steel Structures

1998 ◽  
Author(s):  
T. Lester ◽  
D.J. Kingerley ◽  
S.J. Harris ◽  
S.P. Matthews
Keyword(s):  
Composite Coatings ◽  
Electrochemical Behaviour ◽  
Salt Spray ◽  
Steel Structures ◽  
Cored Wire ◽  
Additional Advantage ◽  
Spray Coatings ◽  
Arc Spray ◽  
Coating Microstructure ◽  
Two Phases

Abstract Zinc and aluminium coatings have been used widely to protect steel structures from corrosion in aggressive and hostile conditions. The more recent development of zinc 15wt% aluminium alloy in a wire form has demonstrated that arc-spray coatings can be produced with a resistance to red rust which is superior to that of the single metals. Competitive 'pseudo' alloy or composite coatings produced by co-spraying wires of zinc and aluminium have been shown to achieve resistance to salt spray conditions similar to this conventional alloy. Work described in this paper confirms these findings and goes on to demonstrate an additional advantage of co-spraying an aluminium -5wt% magnesium instead of aluminium with the zinc. The importance of providing a fine dispersion of the two phases in the 'pseudo' alloy is highlighted and an alternative method of providing a similar dispersion by using a 'cored' wire (e.g. Al-5wt%Mg wire in a zinc sheath) approach has been demonstrated. The importance of 'self sealing' in these coatings after the initial loss of zinc is discussed which is related to the coating microstructure and their electrochemical behaviour in chloride solutions.

scholarly journals Electric arc spray coatings for the naval industry

2011 ◽  
Vol 4 (8) ◽  
pp. 31
Author(s):  
Laura Marcela Dimate Castellanos ◽  
José Alfredo Morales Torres ◽  
Jhon Jairo Olaya Florez
Keyword(s):  
Abrasive Wear ◽  
Electric Arc ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spray Coatings ◽  
Arc Spray ◽  
Thermal Barriers ◽  
Before And After ◽  
Coating Microstructure ◽  
Steel Substrates

Carbon and stainless steel, as well as Fe-Nb-Cr-W coatings were deposited on steel substrates by using electric arc spray, and its possibility of applying such coatings in the naval industry was analyzed. In order to achieve this, the coating microstructure was characterized before and after the corrosion, abrasive wear, and thermal barrier tests. Corrosion resistance was analyzed via potenciodynamic polarization test using a NaCl electrolyte at 3%; abrasive wear resistance was measured by using a three-component system following ASTM G-65 recommendations, while quality control as thermal barriers was studied by using EIS tests. Scanning Electron Microscopy, optical microscopy and X-ray diffraction were used to characterize the microstructure of the coatings.

High Velocity Arc Spray–Superior Surface Anti-Corrosion Technology

2000 ◽  
Author(s):  
X. Binshi ◽  
L. Shican ◽  
M.A. Shining ◽  
Z. Zhenxue
Keyword(s):  
Power Plant ◽  
Corrosion Protection ◽  
High Velocity ◽  
Surface Engineering ◽  
Arc Spraying ◽  
Arc Spray ◽  
High Velocity Arc Spraying ◽  
Power Plant Boiler ◽  
Superior Surface ◽  
Plant Boiler

Abstract This paper discusses the principles of high velocity arc spraying (HVAS) and its use in surface engineering. It also reviews applications in marine environments and power plant boiler pipes, where HVAS coatings provide corrosion protection.

Structure and Properties of Coatings Deposited by High Velocity Arc Spray Technique

1999 ◽  
Vol 122 (3) ◽  
pp. 646-649 ◽  
Author(s):  
Binshi Xu ◽  
Wei Zhang ◽  
Shining Ma ◽  
Baohong Tian ◽  
Xiubing Liang
Keyword(s):  
High Velocity ◽  
Test Results ◽  
Structure And Properties ◽  
Wear Properties ◽  
Properties Of Coatings ◽  
Spray Coatings ◽  
Arc Spray ◽  
Spray Technique ◽  
The Difference ◽  
Sprayed Coatings

The microstructure of spray coatings using a newly developed thermal spray technique, High Velocity Arc Spray (HVAS), was studied and compared with those of regular arc sprayed coatings. The mechanical and wear properties of HVAS coatings were also investigated. The test results showed that HVAS coatings had better mechanical properties than those of regular arc sprayed coatings. The bonding strength of HVAS Al and 3Cr13 coatings was increased by 114 percent and 51.8 percent; the relative wear resistance of HVAS coatings was about twice that of regular arc sprayed coatings. The difference of microstructure and tribological properties between HVAS and regular arc sprayed coatings was discussed. [S0742-4787(00)00203-4]

scholarly journals High Velocity Pulsed Wire-Arc Spray

2000 ◽  
Author(s):  
R.W. Kincaid ◽  
F.D. Witherspoon
Keyword(s):  
High Velocity ◽  
Vision System ◽  
Arc Spraying ◽  
Pulsed Plasma ◽  
Wire Arc Spray ◽  
New Device ◽  
Arc Spray ◽  
High Particle ◽  
Molten Droplets ◽  
Wire Arc Spraying

Abstract Wire arc spraying has traditionally filled metallic coating needs for low end users, while higher quality coatings required the use of higher cost systems. A new high velocity wire arc spray device has been developed through a NASA SBIR project whose high particle velocity capabilities could provide high quality coatings while keeping costs well below those associated with HVOF and plasma spray approaches. In addition, this technique achieves these high velocities in an extremely short acceleration path. This new device employs a pulsed plasma as the accelerative medium for the molten droplets. This pulsed plasma is capable of accelerating the droplets from the tips of the wires up to high velocities and atomizing them to very fine size. This results in a fine microstructure in the deposit. Recent experiments using a Control-Vision system measured velocities for aluminum droplets in the range of 950-1500 m/s and stainless steel droplets in the range of 850 m/s and 925 m/s. These velocities are achieved with an acceleration distance of only 3.2 cm, thus making this process an ideal candidate for coating the interior of automotive cylinder bores and other areas where only a short acceleration region is available.

Microstructure and Anti-Corrosion Properties of Arc-Sprayed Aluminum Coating in Splash Zone

2011 ◽  
Vol 199-200 ◽  
pp. 1949-1953
Author(s):  
Qing Jun Zhu ◽  
Kai Wang
Keyword(s):  
Aluminum Coating ◽  
Splash Zone ◽  
Corrosion Properties ◽  
Corrosion Morphology ◽  
Aluminum Coatings ◽  
Arc Spray ◽  
Mild Carbon Steel ◽  
Dissolution Zone ◽  
Corrosion Behaviors ◽  
Al Coating

Aluminum coatings were developed by arc spray on mild carbon steel Q235. Scanning electron microscopy detection shows that the coatings have good bonding with the substrate and have low porosity. The corrosion behaviors of the coatings in splash zone were studied. The results show that free corrosion potentials of aluminum coatings are much lower than that of Q235. Potentiodynamic polarization measurements reveal that the curves of aluminum coatings have activity anodic dissolution zone, passivation zone and super-passivation zone. Corrosion morphology and energy dispersive spectrometers show that Cl- can penetrate into the coatings and some of the substrate has been corroded. The arc spray Al-coating develops a film of corrosion products on the coating surface, which tend to seal the pores in the coatings. Arc spray aluminum coatings can protect the substrate from corrosion in splash zone.

Investigation on the Permeability of Electric Arc Spraying Sealing Coat with Nano-Sized TiO2,SiO2 of Steel Structures

2011 ◽  
Vol 239-242 ◽  
pp. 343-346
Author(s):  
Qing Tao ◽  
Yan Wei Sui ◽  
Zhi Sun ◽  
Yun Qi An ◽  
Xin Zhao
Keyword(s):  
Energy Spectrum ◽  
Light Microscope ◽  
Protective Property ◽  
Steel Structure ◽  
Steel Structures ◽  
Metal Substrate ◽  
Electric Arc ◽  
Organic Coatings ◽  
Arc Spraying ◽  
Binding Force

In this dissertation, the electric arc spraying coatings on steel structure were sealed over with the organic coatings addition with nano-sized TiO2, SiO2. Some means as light microscope, SEM, energy spectrum and binding force tests were adopted for research the permeability of the sealer. The mechanism for permeable closeness of the sealer was mainly discussed. The results indicated that homogeneous nanofillers can improvement the runnability and permeability of the epikote, stiffen the adhesion between the coatings and the metal substrate. The coating can seal the metal substrate effectively; enhance the protective property of the tectonic systems with electric arc spraying coatings and organic coatings.

An Empirical Investigation of Factors Affecting Stock Prices in Vietnam

2014 ◽  
pp. 74-89 ◽  
Author(s):  
Vinh Vo Xuan
Keyword(s):  
Exchange Rates ◽  
Crude Oil ◽  
Foreign Exchange ◽  
Stock Prices ◽  
Global Financial Crisis ◽  
Oil Prices ◽  
Foreign Exchange Rates ◽  
Factors Affecting ◽  
Crude Oil Prices ◽  
Before And After

This paper investigates factors affecting Vietnam’s stock prices including US stock prices, foreign exchange rates, gold prices and crude oil prices. Using the daily data from 2005 to 2012, the results indicate that Vietnam’s stock prices are influenced by crude oil prices. In addition, Vietnam’s stock prices are also affected significantly by US stock prices, and foreign exchange rates over the period before the 2008 Global Financial Crisis. There is evidence that Vietnam’s stock prices are highly correlated with US stock prices, foreign exchange rates and gold prices for the same period. Furthermore, Vietnam’s stock prices were cointegrated with US stock prices both before and after the crisis, and with foreign exchange rates, gold prices and crude oil prices only during and after the crisis.

Dynamic Characteristics of Base-Isolated Steel Frame under Seismic Ground Motion

2011 ◽  
Vol 255-260 ◽  
pp. 2341-2344
Author(s):  
Mohammad Saeed Masoomi ◽  
Siti Aminah Osman ◽  
Ali Jahanshahi
Keyword(s):  
Ground Motion ◽  
Base Isolation ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Seismic Load ◽  
Vector Method ◽  
Seismic Ground Motion

This paper presents the performance of base-isolated steel structures under the seismic load. The main goals of this study are to evaluate the effectiveness of base isolation systems for steel structures against earthquake loads; to verify the modal analysis of steel frame compared with the hand calculation results; and development of a simulating method for base-isolated structure’s responses. Two models were considered in this study, one a steel structure with base-isolated and the other without base-isolated system. The nonlinear time-history analysis of both structures under El Centro 1940 seismic ground motion was used based on finite element method through SAP2000. The mentioned frames were analyzed by Eigenvalue method for linear analysis and Ritz-vector method for nonlinear analysis. Simulation results were presented as time-acceleration graphs for each story, period and frequency of both structures for the first three modes.

scholarly journals Experimental study on fatigue performance of Q420qD high-performance steel cross joint in complex environment

2021 ◽  
Author(s):  
Haigen Cheng ◽  
Cong Hu ◽  
Yong Jiang
Keyword(s):  
Fatigue Life ◽  
High Performance ◽  
Steel Structure ◽  
Steel Structures ◽  
Fatigue Tests ◽  
Fatigue Performance ◽  
Corrosive Media ◽  
Joint Connection ◽  
High Performance Steel ◽  
The Cross

AbstractThe steel structure under the action of alternating load for a long time is prone to fatigue failure and affects the safety of the engineering structure. For steel structures in complex environments such as corrosive media and fires, the remaining fatigue life is more difficult to predict theoretically. To this end, the article carried out fatigue tests on Q420qD high-performance steel cross joints under three different working conditions, established a 95% survival rate $$S{ - }N$$ S - N curves, and analyzed the effects of corrosive media and high fire temperatures on its fatigue performance. And refer to the current specifications to evaluate its fatigue performance. The results show that the fatigue performance of the cross joint connection is reduced under the influence of corrosive medium, and the fatigue performance of the cross joint connection is improved under the high temperature of fire. When the number of cycles is more than 200,000 times, the design curves of EN code, GBJ code, and GB code can better predict the fatigue life of cross joints without treatment, only corrosion treatment, and corrosion and fire treatment, and all have sufficient safety reserve.

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