Study on Corrosion-Resisting Properties of High-Speed Arc Sprayed Zn-Al Alloy Coating in Caverns

2011 ◽  
Vol 399-401 ◽  
pp. 2072-2078
Author(s):  
Miao Lou ◽  
Yu Feng Lu ◽  
Chun Lin Ma ◽  
Yong Le Hu ◽  
Meng Zhou ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Speed ◽  
Salt Spray ◽  
Alloy Coating ◽  
Arc Spraying ◽  
Al Alloy ◽  
Test Study ◽  
High Velocity Arc Spraying ◽  
Steel Substrates ◽  
Al Coating

Zn、Al alloy coatings were prepared by high velocity arc spraying technology on 16MnR steel substrates, With the design salt spray test, Study on the corrosion resistance of the Zn、Al alloy coating in the grotto environment. The porosity of the metal coating and the compact of the corrosion are infection on the corrosion resistance of the coating. Al coating and Zn/Al(300/100) coating corrosion resistance better than others on 16MnR steel.

The Corrosion Mechanism of Zn-5%Al-0.3%Mg Coating

2011 ◽  
Vol 189-193 ◽  
pp. 1284-1287
Author(s):  
Bo Gao ◽  
Shi Wei Li ◽  
Yi Hao ◽  
Gan Feng Tu ◽  
Liang Hu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Alloy Coating ◽  
Mg Alloy ◽  
Corrosion Mechanism ◽  
Neutral Salt ◽  
Test Results ◽  
Crystal Boundary ◽  
Cold Rolled ◽  
Al Coating

A new hot dip Zn-5%Al-0.3%Mg alloy coating was performed on cold rolled common steel. The hot-dip process was executed by self-made hot dip galvanising simulator (China patent, No.201010160353). The corrosion resistance of alloy-coated steels was detected by neutral salt spray test . SEM and EDS test results demonstrate that Mg is mainly distributed in the crystal boundary. XRD test results shows corrosion product of Zn-5%Al-0.3%Mg alloy coating is mainly Zn5(OH)8Cl2•H2O. The characteristic of Zn5 (OH)8Cl2•H2O is dense and insoluble, so it is protective. In order to study the anticorrosion mechanism, all the tests of the Zn-5%Al-0.3%Mg alloy were carried out with Zn-5%Al coating together.

scholarly journals Microstructural and Corrosion Behavior of High Velocity Arc Sprayed FeCrAl/Al Composite Coating on Q235 Steel Substrate

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 542 ◽  
Author(s):  
Ndumia Joseph Ndiithi ◽  
Min Kang ◽  
Jiping Zhu ◽  
Jinran Lin ◽  
Samuel Mbugua Nyambura ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
High Velocity ◽  
Steel Substrate ◽  
Arc Spraying ◽  
Spray Parameters ◽  
Q235 Steel ◽  
Electrochemical Tests ◽  
Al Composite ◽  
Al Coating

High velocity arc spraying was used to prepare FeCrAl/Al composite coating on Q235 steel substrate by simultaneously spraying FeCrAl wire as the anode and Al wire as the cathode. The composite coating was sprayed with varying voltage and current to obtain optimum coating characteristics. FeCrAl coating was also prepared for comparison purposes. The surface microstructure of the coatings was characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The average microhardness of the coatings and the substrate was analyzed and compared. Corrosion resistance was investigated by means of electrochemical tests. The image results showed that a lamellar structure consisted of interwoven layers of FeCrAl and Al. Al and FeCr constituted the main phases with traces of oxides and AlFe intermetallic compounds. The average porosity was reduced and microhardness of the coatings was improved with increasing voltage and current. The FeCrAl/Al coating formed alternating layers of hard and ductile phases; the corrosion resistance of the coatings in the sodium chloride (NaCl) solution depended on the increase in Al content and spray parameters. The corrosion resistance tests indicated that FeCrAl/Al coating had a better corrosion resistance than the FeCrAl coating. FeCrAl/Al can be used to coat steel substrates and increase their corrosion resistance.

scholarly journals Corrosion resistance of zinc-based systems in NaCl environment

2013 ◽  
Vol 61 (5) ◽  
pp. 1487-1495 ◽  
Author(s):  
Jiří Votava
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Current Trend ◽  
Zinc Coating ◽  
Degradation Process ◽  
Engineering Industry ◽  
Anticorrosion Protection ◽  
Al Coating ◽  
Measurement Of Thickness

Metal components in engineering, industry and agriculture are subjects of degradation process influenced by corrosion which result in changes of mechanical characteristics. The current trend of anticorrosion protection is aimed at inorganic metal zinc-based coatings, such as zinc dipping which can be improved by duplex protection. This paper deals with two types of corrosion protection of steel components by zinc coating, first of which is produced by hot dip galvanizing, the other by Zn-Al spray. Hot dip galvanizing was processed in working conditions; the Zn-Al coating was sprayed following the instructions of producer. It is a special aerosol with particles of Zn and Al sized approximately 5 µm. There have been processed the following tests: analysis of element structure, test of corrosion resistance in aggressive environment of salt spray according to ČSN ISO 9227, further measurement weight of applied coatings according to ČSN EN ISO 3892 and measurement of thickness of passivating coating. There was also made an analysis of coating tenacity on bending pin according to ČSN EN ISO 8401. Quality of applied coatings was evaluated following the metallographic scratch pattern.

scholarly journals Ultrasonic Sensors-Assisted Corrosion Studies on Surface Coated AlSi9Cu3 Alloy Die Castings

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 85
Author(s):  
Yuh-Chung Hu ◽  
Senthil Kumaran Selvaraj ◽  
Manivannan Subramanian ◽  
Kathiravan Srinivasan ◽  
Srinivasan Narayanan
Keyword(s):  
Corrosion Resistance ◽  
Die Casting ◽  
Pure Aluminum ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Al Alloy ◽  
Neutral Salt ◽  
Powder Coatings ◽  
Acrylic Paint ◽  
Epoxy Primer

A novel phenomenon known as Industry X.0 is becoming extremely popular for digitizing and reinventing business organizations through the adaption of rapid and dynamic technological, innovational, and organizational changes for attaining the profitable revenue. This work investigates the die-casted commercially pure aluminum alloyed with 9% silicon and 3% copper (AlSi9Cu3) that is produced through the gravity die casting process. Further, the degradation of surface coating on die-casted AlSi9Cu3 alloy was explored. The acrylic paint electrodeposition (ED) coat, 2-coat polyester without primer and 3-coat polyester with epoxy primer powder coatings were used in this study. Moreover, the 3.5 wt.% of sodium chloride (3.5 wt.% of NaCl) test solution was used for electrochemical and salt spray test and the tools used to assess electrochemical properties were electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and neutral salt spray test (NSS). The microstructure of AlSi9Cu3 after corrosion exposure was investigated; also, the microstructure of coated and uncoated AlSi9Cu3 samples was analyzed by SEM microscopy after corrosion exposure. Besides, the electrochemical studies were also carried out on the Al alloy die casting. It was found that acrylic paint ED coatings exhibited higher corrosion resistance than 2-coat polyester without primer & 3-coat polyester with epoxy primer powder coatings. Acrylic paint ED coating showed higher corrosion resistance in AC and a lower value in DC and 3-coat polyester with epoxy primer powder coating displayed higher corrosion resistance in DC and a lower value in AC.

Study on Properties of Zn-Al-Mg-RE Coatings by Arc Spraying

2013 ◽  
Vol 804 ◽  
pp. 79-84
Author(s):  
Fei Lu ◽  
Zhao Qian Xie ◽  
Yu Feng Lu ◽  
Miao Lou ◽  
Meng Zhou ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Arc Spraying ◽  
Long Term Effects ◽  
Electrochemical Protection ◽  
X Ray ◽  
Electrochemical Tests ◽  
Excellent Corrosion Resistance ◽  
Corrosion Reaction ◽  
High Velocity Arc Spraying

In order to improve the organization, reduce the porosity, compact the structure and enhance the corrosion resistance of the coating, Zn-Al-Mg-RE coating system was prepared by high velocity arc spraying. The surface appears, phase composition and electrochemical properties of the coating were characterized by scanning electron microscope, X-ray radiation diffaction and electrochemical workstation. The results indicated that the coatings were compact. The coatings were mainly zinc and aluminum phase. In corrosion of immersion, the reaction resistance and coating resistance of coatings quickly become bigger, the surface of coatings become more compact, and the corrosion reaction is more difficult. Electrochemical tests showed that the coating had excellent corrosion resistance. The electrochemical protection and self-sealing effect of coatings can have long-term effects on anticorrosion.

Effect of Heat Treatment to Twin-Wire Arc Spraying Ni-5wt.%Al Coating on 6061-T6 Aluminum Alloy Diffusion

2013 ◽  
Vol 631-632 ◽  
pp. 424-428
Author(s):  
J.X. Wang ◽  
J.F. Sun ◽  
Z.P. Wang
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Interface Reaction ◽  
Alloy Coating ◽  
Arc Spraying ◽  
Twin Wire Arc Spraying ◽  
Wire Arc Spraying ◽  
Al Coating ◽  
And Diffusion ◽  
Original Coating

In this study, Ni-5wt.%Al coating was fabricated on the 6061-T6 aluminum alloy substrate by twin-wire arc spraying technology. Through different heat treatment process, effect of microstructure and phase structure was studied with different temperature and time. Interface reaction mechanism of alloy coating/substrate and diffusion behavior of elements was discussed. Heat treatment was carried out at 400°C，480°C，550°C and respective for 4h, 24h, 48h. The XRD , SEM and EDS results showed that main phases of Ni-5wt.%Al original coating were composed of Ni solid solution, in addition to a small amount of Al2O3, NiO and Al4Ni3. Phase composition has basically not changed, interface of the coating/substrate occurred diffusion, which was controlled by the diffusion of Al atoms. Intermetallic compounds of NiAl3 and Ni2Al3 were formed in interface of coating/substrate, and interface diffusion area gradually was thickened.

Study on Corrosion Mechanism of Arc Sprayed Zn-Al-Mg Coatings by XRD and EIS

2011 ◽  
Vol 230-232 ◽  
pp. 85-88
Author(s):  
Zi Xin Zhu ◽  
Ai Jun Li ◽  
Bin Shi Xu
Keyword(s):  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Low Carbon Steel ◽  
Electrochemical Corrosion ◽  
Arc Spraying ◽  
Al Alloy ◽  
Corrosion Mechanism ◽  
Low Carbon ◽  
Electrochemical Corrosion Resistance ◽  
Steel Substrates

Cored wires and arc spraying were used to produce high Mg content Zn-Al-Mg alloy coatings on low carbon steel substrates. And the corrosion mechanism of the Zn-Al-Mg coatings was investigated comparing with Zn-Al alloy coatings by X-ray diffractometer (XRD) and Electrochemical impedance spectroscopy (EIS). The results show that, The Zn-Al-Mg coatings show higher electrochemical corrosion resistance in salt solution than Zn-Al coatings. With addition of Mg, the corrosion products can block off the pores in the Zn-Al-Mg coating, which is so-called self sealing, and thus prevent attack on the underlying steel substrate.

Production of Fe-Al Alloy Coat on Steel Block by Scanning Laser Beam

2014 ◽  
Vol 1017 ◽  
pp. 794-799 ◽  
Author(s):  
Masayuki Nunobiki ◽  
Yasunori Harada ◽  
Koichi Okuda
Keyword(s):  
High Speed ◽  
Laser Scanning ◽  
Base Material ◽  
High Strength ◽  
Alloy Coating ◽  
Treatment Temperature ◽  
Manufacturing Cost ◽  
Al Alloy ◽  
Processing Conditions ◽  
Local Surface

Recently, the demand for long life to industrial products has risen. The high strength alloy coating on necessary part can decrease a manufacturing cost for life prolongation. This study proposes a laser surface alloying method to form an Fe-Al alloy coating on a carbon steel. By laser heating to an Al foil stuck on the steel, the mutual diffusion proceeds and the Fe-Al alloy grows. The material property of the generated alloy is greatly different according to a heat treatment temperature. For example, Fe3Al grows at 950 °C or more, and it has high toughness. A furnace heating effects the properties of inside of base material negatively. A high-frequency heating is not suitable for a local surface reforming. The laser processing is suitable for a local surface reforming. A defocused CO2 laser was irradiated to the Al foil stuck on the steel block by the shot lining in various processing conditions. The metal structures of the laser irradiated area was observed, to search for the suitable processing conditions for alloy coating. It was clarified that a local Fe-Al alloy coat was able to be formed without change of the properties of base material by high speed laser scanning.

The formation of a hydrotalcite coating on the aluminium alloy 6060 using a spray system

Clay Minerals ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 583-592 ◽  
Author(s):  
Lingli Zhou ◽  
Henrik Friis ◽  
Melanie Roefzaad ◽  
Kasper Bondo Hansen ◽  
Sara Eisenhardt ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Layer Structure ◽  
Salt Spray ◽  
Al Alloy ◽  
Acetate Solution ◽  
Average Thickness ◽  
Spray System ◽  
Filiform Corrosion ◽  
Better Than

AbstractCoatings with the composition of Li-Al-NO3 hydrotalcite were formed on the Al alloy 6060 using a spray system. The coatings consist of crystals with a typical hydrotalcite structure. Dense, uniform and blade-like flakes cover completely the surface of the Al substrate. The coatings display a multi-layer structure with average thickness of ∼1000 nm. The hydrotalcite-coated samples performed better than those without coatings in salt-spray and filiform-corrosion tests, and further treatment involving sealing with a Mg acetate solution and dipping in a H2O2 + Ce-based solution improved the corrosion resistance ability.

Influence of Rare Earth on Hot-Dipped 55%Al-Zn Alloy Coating

2013 ◽  
Vol 774-776 ◽  
pp. 1132-1136 ◽  
Author(s):  
Tai Xiong Guo ◽  
Xue Qiang Dong ◽  
Shu Hui Deng ◽  
Feng Li ◽  
Yi Lin Zhou
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Simulation Experiment ◽  
Steel Substrate ◽  
Intermetallic Layer ◽  
Alloy Coating ◽  
Al Alloy ◽  
Zinc Dross ◽  
Zn Alloy ◽  
The Rare Earth

Simulation experiment was done to investigate the effects of rare earth on hot-dipped Zn-55%Al alloy coating. The results show that the rare earth has little effect on the zinc dross and its burning loss is about 10%. The microstructure of coating is similar to that of solidification bath, and which is made up of phases of rich aluminum, rich zinc, rich silicon and rare earth, and intermetallic layer of Al-Zn-Fe-Si. The rare earth phase is needle or rod, and mainly distributed inside rich zinc phase and on the interface between the coating and steel substrate. The rare earth has no obvious influence on coating grain and spangle size. The appropriate addition of rare earth would be helpful to improve the coating bending formability and corrosion resistance.

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