Arc thermal metal spray for the protection of steel structures: an overview

2015 ◽  
Vol 33 (1-2) ◽  
pp. 31-61 ◽  
Author(s):  
Han Seung Lee ◽  
Mohamed A. Ismail ◽  
Hong Bok Choe
Keyword(s):  
Spray Coating ◽  
Steel Structures ◽  
Thermal Spray Coating ◽  
Experimental Program ◽  
Technical Data ◽  
The Past ◽  
Metal Spraying ◽  
Spraying Method ◽  
Metal Spray

AbstractCoating for corrosion protection was popular during the past decade. Thermal spray coating played an important role during that time. In recent years, arc thermal metal spray coating became widely used. Arc thermal metal spraying method (ATMSM) provides proven long-term protective coating systems using zinc, aluminum, and their alloys for steel work in a marine environment. This paper provides a review of the latest development in ATMSM by evaluating the current techniques in the industry and by analyzing technical data obtained from an extensive experimental program.

scholarly journals Electromagnetic Shielding Performance of Carbon Black Mixed Concrete with Zn–Al Metal Thermal Spray Coating

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 895 ◽  
Author(s):  
Han-Seung Lee ◽  
Jin-ho Park ◽  
Jitendra Kumar Singh ◽  
Hyun-Jun Choi ◽  
Soumen Mandal ◽  
...  
Keyword(s):  
Carbon Black ◽  
Thermal Spray ◽  
Spray Coating ◽  
Concrete Specimen ◽  
Thermal Spray Coating ◽  
Concrete Wall ◽  
Concrete Walls ◽  
Al Coating ◽  
Metal Spraying ◽  
Spraying Method

The electromagnetic pulse (EMP) is a destructive phenomenon which harms the building, telecommunication, and IT based infrastructure. Thus, it is required to reduce the effect of EMP using shielding materials. In the present study, we have used different thickness of concrete walls by incorporating 1 and 5 wt% of carbon black, as well as 100 µm thick Zn–Al coating using the arc thermal metal spraying method (ATMSM). The EMP was evaluated using waveguide measurement fixture for shielding performance of the concrete wall in the range of 0.85 to 1 GHz frequency. The results reveal that the maximum value, i.e., 41.60 dB is shown by the 5-300-N specimen before application of Zn–Al coating where the thickness of concrete wall was 300 mm and 5% carbon black. However, once the 100 µm thick Zn–Al coating was applied on concrete specimen, this value was increased up to 89.75 dB. The increase in shielding values around 48 dB after using the Zn–Al coating is attributed to the reflection loss of the metal thermal spray coating. Thus, the Zn–Al coating can be used for EMP application instead of metallic plate.

Anti-Corrosion Performance of Zn-Al Thermal Metal Spraying Method Using Steel Structures

2007 ◽  
Vol 348-349 ◽  
pp. 453-456
Author(s):  
Sang Hyun Lee ◽  
Han Seung Lee ◽  
Je Woon Kyung ◽  
Chang Soo Kang ◽  
Man Hae Han
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Current Density ◽  
Steel Structures ◽  
Corrosion Current ◽  
Corrosion Performance ◽  
Base Materials ◽  
Resistance Reaction ◽  
Resistance Performance ◽  
Metal Spraying ◽  
Spraying Method

This study performs an electrochemical experiment to quantitatively evaluate the corrosion resistance performance in a Zn-Al thermal metal spraying method and produces corrosion current density according to the type of corrosion resistance methods. In the results of the calculation, the corrosion membrane produced in a Zn-Al thermal metal spraying method showed voltage differences more than 300 mV and that demonstrated enough corrosion performance with the corrosion resistance reaction of base materials and proper Zn-Al ratio, such as 50:50. Also, the results exhibited that the corrosion speed in a Zn-Al thermal metal spraying method was 0.66 time faster than that of the zinc galvanizing method in the estimation based on the standard of corrosion resistance service years in a zinc galvanizing method (JIS H 8641).

Experimental Study on the Adhesion Properties of Zn-Al Metal Spray Method for Steel Structures

2008 ◽  
Vol 385-387 ◽  
pp. 613-616
Author(s):  
Joo Ho Jin ◽  
Han Seung Lee
Keyword(s):  
Experimental Study ◽  
Quantitative Assessment ◽  
Steel Plate ◽  
Steel Structures ◽  
Treatment Method ◽  
Adhesion Properties ◽  
Surface Conditions ◽  
Spray Method ◽  
Metal Spraying ◽  
Metal Spray

Examination about sticking intensity security way of normal temperature metal spraying covering is required compulsorily accordingly with quantitative assessment about steel plate's surface roughness to secure adhesive power of steel materials and metal membrane stably at application of way method of construction by normal temperature metal spraying. In case of metal spraying, Sticking strength of metal spraying way finish is influenced greatly, and it is judged that is desirable that manages Sm/Rz by 6 lows to secure more than sticking intensity 20kgf/cm2 by Sm/Rz that evaluate that is rough of nature surface. The purpose of this study was to analyze an adhesion strength of metal spraying finish layer with the surface conditions of steel plate. For the purpose the experimental factors such as anticorrosive finish method and surface treatment method were selected.

scholarly journals Role of Coating Processes on the Corrosion Kinetics and Mechanism of Zinc in Artificial Seawater

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7464
Author(s):  
Jitendra Kumar Singh ◽  
Soumen Mandal ◽  
Raihana Jannat Adnin ◽  
Han-Seung Lee ◽  
Hyun-Min Yang
Keyword(s):  
Corrosion Resistance ◽  
Thermal Spray ◽  
Steel Substrate ◽  
Spray Coating ◽  
Steel Structures ◽  
Thermal Spray Coating ◽  
Artificial Seawater ◽  
Arc Spraying ◽  
Plasma Arc ◽  
Resistance Performance

Zinc (Zn) coating is being used to protect steel structures from corrosion. There are different processes to deposit the coating onto a steel substrate. Therefore, in the present study, a 100 µm thick Zn coating was deposited by arc and plasma arc thermal spray coating processes, and the corrosion resistance performance was evaluated in artificial seawater. Scanning electron microscopy (SEM) results showed that the arc thermal spray coating exhibited splats and inflight particles, whereas plasma arc spraying showed a uniform and dense morphology. When the exposure periods were extended up to 23 d, the corrosion resistance of the arc as well as the plasma arc thermal spray coating increased considerably. This is attributed to the blocking characteristics of the defects by the stable hydrozincite (Zn5(OH)6(CO3)2).

Deterioration Characteristics of Overlapping Layers between Al-5Mg Thermal Spray Coating and Heavy-Duty Paint Coating

2019 ◽  
Vol 972 ◽  
pp. 235-240 ◽  
Author(s):  
Mu Ye Yang ◽  
Kazuyoshi Muto ◽  
Shigenobu Kainuma ◽  
Jin Xuan Du ◽  
Hirokazu Miyata
Keyword(s):  
Thermal Spray ◽  
Spray Coating ◽  
Steel Structures ◽  
Thermal Spray Coating ◽  
Heavy Duty ◽  
Paint Coating ◽  
Spray Coatings ◽  
Steel Base ◽  
Eis Measurements ◽  
Deterioration Characteristics

In recent years, Al-5Mg alloy thermal spray coatings have been used as an anti-corrosion coating applied for various components of steel structures, in some cases it was covered by the conventional heavy-duty coating. However, the deterioration characteristics of overlapping layers between thermal spray layer and heavy-duty paint coating still not clear. In this study, to compare the anti-corrosion characteristics of the single thermal spray coating and overlapping layers, the accelerated cyclic exposure tests were carried out on specimens with three types of coating layers. To clarify the deterioration characteristics, the cross-cut defect were introduced into specimens, and the EIS measurements, glossiness test, EPMA elemental analyses were conducted on test specimens. The test results indicated that the deterioration of the overlapping layer at the steel base-exposed portion occurs earlier than the case of Al-5Mg thermal spray coating. In addition, the deterioration of thermal spray coating was accelerated by the sealing treatment in specimen with overlapping layers.

Friction Coefficient in High Tension Bolt Joints Using a Zn/Al Metal Spray Corrosion Resistance Method

2007 ◽  
Vol 348-349 ◽  
pp. 465-468
Author(s):  
Tae Soo Kim ◽  
Han Seung Lee ◽  
Sung Ho Tae ◽  
Sung Ok Oh
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Friction Coefficient ◽  
Steel Structures ◽  
Public Attention ◽  
Resistance Method ◽  
High Tension ◽  
Metal Spraying ◽  
Metal Spray

In recent years, the friction coefficient decline in the joints of steel structures caused by corrosion has drawn public attention. Therefore, this study investigated the friction coefficient and surface roughness of high tension bolt joints using a Zn/Al metal spraying corrosion resistance method to estimate the application possibility of the Zn/Al metal spraying corrosion resistance method on the joints of steel structures. According to results, the friction coefficient of Zn/Al metal spraying was 0.50 or more. In addition, the friction coefficient increased according to the decrease in surface roughness (Sm/Rz). Therefore, the Zn/Al metal spraying is applicable to a corrosion resistance method for high tension bolt joints.

Enabling Community Well-being Self-Monitoring in the Context of Mining: The Naskapi Nation of Kawawachikamach

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Robert Klinck ◽  
Ben Bradshaw ◽  
Ruby Sandy ◽  
Silas Nabinacaboo ◽  
Mannie Mameanskum ◽  
...  
Keyword(s):  
Indigenous Peoples ◽  
Well Being ◽  
Aboriginal Community ◽  
Self Monitoring ◽  
Community Engaged Research ◽  
The Past ◽  
Mineral Development ◽  
Iron Deposits ◽  
Term Monitoring

The Naskapi Nation of Kawawachikamach is an Aboriginal community located in northern Quebec near the Labrador Border. Given the region’s rich iron deposits, the Naskapi Nation has considerable experience with major mineral development, first in the 1950s to the 1980s, and again in the past decade as companies implement plans for further extraction. This has raised concerns regarding a range of environmental and socio-economic impacts that may be caused by renewed development. These concerns have led to an interest among the Naskapi to develop a means to track community well-being over time using indicators of their own design. Exemplifying community-engaged research, this paper describes the beginning development of such a tool in fall 2012—the creation of a baseline of community well-being against which mining-induced change can be identified. Its development owes much to the remarkable and sustained contribution of many key members of the Naskapi Nation. If on-going surveying is completed based on the chosen indicators, the Nation will be better positioned to recognize shifts in its well-being and to communicate these shifts to its partners. In addition, long-term monitoring will allow the Naskapi Nation to contribute to more universal understanding of the impacts of mining for Indigenous peoples.

Courting the Youth Vote in 2008: The Obama Effect

2009 ◽  
Vol 5 ◽  
Author(s):  
Lindsey C Bohl
Keyword(s):  
Presidential Elections ◽  
Voter Registration ◽  
The Internet ◽  
The Past ◽  
Several Variables ◽  
High Turnout ◽  
Short And Long Term ◽  
Use Of The Internet ◽  
Youth Vote

This paper examines a few of the numerous factors that may have led to increased youth turnout in 2008 Election. First, theories of voter behavior and turnout are related to courting the youth vote. Several variables that are perceived to affect youth turnout such as party polarization, perceived candidate difference, voter registration, effective campaigning and mobilization, and use of the Internet, are examined. Over the past 40 years, presidential elections have failed to engage the majority of young citizens (ages 18-29) to the point that they became inclined to participate. This trend began to reverse starting in 2000 Election and the youth turnout reached its peak in 2008. While both short and long-term factors played a significant role in recent elections, high turnout among youth voters in 2008 can be largely attributed to the Obama candidacy and campaign, which mobilized young citizens in unprecedented ways.

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