scholarly journals Dual-Layer Corrosion-Resistant Conversion Coatings on Mg-9Li Alloy via Hydrothermal Synthesis in Deionized Water

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1396
Author(s):  
Dan Song ◽  
Beibei Lian ◽  
Yulong Fu ◽  
Guowei Wang ◽  
Yanxin Qiao ◽  
...  
Keyword(s):  
Hydrothermal Reaction ◽  
Conversion Coating ◽  
Deionized Water ◽  
Corrosion Performance ◽  
Hydrothermal Conversion ◽  
High Chemical ◽  
Corrosive Media ◽  
Corrosion Resistant ◽  
Lithium Alloys ◽  
Stacking Structure

The formation of a corrosion-resistant coating by the hydrothermal method is an effective way to provide significant protection to magnesium alloys. However, it is a challenge to prepare such a coating on magnesium-lithium alloys because of its high chemical activity. Herein, the dual-layer structured corrosion-resistant conversion coating composed with Mg(OH)2 and LiOH was successfully synthesized on Mg-9Li alloy by the optimization of the hydrothermal reaction in deionized water. The coating synthesized at 140 °C for 2 h has the best anti-corrosion performance in all obtained coatings, which has a uniform and compact coating with thickness of about 3 μm. The improvement of the hydrophobicity due to the stacking structure of the surface layer, as well as the barrier effect of its inner compact coating on corrosive media, lead to the excellent anti-corrosion performance of the obtained hydrothermal conversion coating

UNILOY 50Cr/50Ni

Alloy Digest ◽  
1969 ◽  
Vol 18 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Heat Treating ◽  
Oil Refinery ◽  
Corrosive Media ◽  
Corrosion Resistant ◽  
Temperature Performance ◽  
Pulping Liquors

Abstract UNILOY 50Cr/50Nj is an improved corrosion-resistant, wrought alloy with outstanding resistance to a wide variety of corrosive media. It is recommended for oil refinery heaters, incinerator components, metallurgical heat treating furnace components and reactor vessels for treating pulping liquors. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cr-2. Producer or source: Universal Cyclops Steel Corporation.

scholarly journals Hydrothermal synthesis of nanocrystalline hydroxyapatite–graphene nanosheet on Ti-6Al-7Nb: mechanical and in vitro corrosion performance

2021 ◽  
Vol 32 (4) ◽  
Author(s):  
Oktay Yigit ◽  
Burak Dikici ◽  
Niyazi Ozdemir
Keyword(s):  
Hydrothermal Reaction ◽  
Hybrid Coatings ◽  
Stoichiometric Ratio ◽  
Corrosion Performance ◽  
Graphene Nanosheet ◽  
Graphene Layers ◽  
Nanocrystalline Hydroxyapatite ◽  
One Step ◽  
Nano Size

AbstractThe hybrid coatings containing the graphene nano-sheet (GNS) and nano-hydroxyapatite (nHA) phases have been successfully synthesized on Ti6Al7Nb alloys by a one-step hydrothermal method. The hydrothermal reaction was carried out for 24 h at 200 °C. The GNS ratio has been altered as 1, 3, 5 and 7 wt.% in the coatings and, the results have compared with non- GNS containing coatings. The effect of the GNS ratio on the microstructure, hardness, and in vitro corrosion responses has been investigated in detail. The characterizations of the coatings were carried out by SEM, EDS, AFM, XRD and, FTIR. The corrosion behavior of the hybrid coatings was compared in Kokubo’s solution at 37 °C by using potentiodynamic polarization tests. The results showed that the hydroxyapatite phases were deposed on the graphene layers with nano-size nucleation with its Ca/P stoichiometric ratio. The best hydrophilicity (~52°) property has been obtained in nHA/3GNS coatings. In addition, the corrosion rates of coatings increased in the following order: nHA/3GNS < nHA/1GNS < nHA/7GNS < nHA/5GNS < only nHA.

High-Temperature Corrosion Performance of FeAl-Based Alloys Containing Carbon in Molten Salt

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2040
Author(s):  
Munish Kumar ◽  
Ravi Kant ◽  
Suresh Chand ◽  
Ujjwal Prakash ◽  
Shankar Sehgal ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Molten Salts ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
Corrosive Media ◽  
Al2o3 Layer ◽  
X Ray ◽  
Aggressive Environment ◽  
Arc Melting ◽  
Ti Addition

Corrosion behavior of FeAl-based alloys containing carbon produced through arc melting in argon atmosphere has been studied at 500 °C to 700 °C. The samples were tested in the aggressive environment of molten salts (80%V2O5/20%Na2SO4). The corrosion behavior was observed by weight change method and the layer products formed were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The different phase components were observed in the surface layer after the test in Fe-22Al alloy. A protective Al2O3 layer was confirmed for Fe-22Al alloy containing carbon only. However, an additional TiO layer was also observed in Fe-22Al alloy containing carbon with Ti addition. The microstructural and XRD examinations revealed that this additional TiO layer protects better against penetration of corrosive media. The corrosion resistance behavior of FeAl-based alloys were addressed on the basis of microstructural evidence.

scholarly journals Corrosionfracture kinetics in welded pipes in chlorine-saturated carbon dioxide oilfield media

2021 ◽  
Vol 225 ◽  
pp. 01007
Author(s):  
Anna Fedotova ◽  
Mikhail Vyboischik ◽  
Dmitry Kazdayev ◽  
Sergey Knyazkin ◽  
Tamara Tetyueva
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Operating Conditions ◽  
Corrosive Media ◽  
Corrosion Resistant ◽  
Corrosion Rates ◽  
Stavropol Region ◽  
Chlorine Ions ◽  
Steel 20 ◽  
Grade Steel

Bypass tests of Ø219×8mm 13KhFA, 08KhMFChA, 20-ksh (steel 20 corrosion resistant cold resistant) and Grade steel 20 piping spools were carried out on an oil-gathering line of one of the oilfields in the Stavropol region. Tubing condition was checked after 7, 15, 17 and 23 months of testing. After two years in service no change was found in mechanical properties of the base metal or weldments manufactured from 13KhFA and 08KhMFChA steels. It has been demonstrated that the formation of chromium-containing phase in corrosion products inhibits the penetration of chlorine ions from corrosive media to the surface of metal and thus reduces corrosion rates. Estimated, laboratory and comparison passivation coefficients have been proposed. These coefficients make it possible to predict the level of steel self-passivation with regard to operating conditions of particular oilfields.

scholarly journals Effect of Synthesizing Temperature on Microstructure and Electrochemical Property of the Hydrothermal Conversion Coating on Mg-2Zn-0.5Mn-Ca-Ce Alloy

Metals ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 44 ◽  
Author(s):  
Guanghui Guo ◽  
Dan Song ◽  
Jinghua Jiang ◽  
Aibin Ma ◽  
Liwen Zhang ◽  
...  
Keyword(s):  
Electrochemical Property ◽  
Conversion Coating ◽  
Hydrothermal Conversion

Research on Effects of Inhibitors on Anti-Corrosion Performance of Reinforced Bar in the Concrete

2011 ◽  
Vol 239-242 ◽  
pp. 1195-1198 ◽  
Author(s):  
Liu Bin Song ◽  
Dao Wu Yang ◽  
Zhong Liang Xiao ◽  
Feng Zhang
Keyword(s):  
Open Circuit Potential ◽  
Electrode Array ◽  
Open Circuit ◽  
Reinforcing Bars ◽  
Corrosion Performance ◽  
Cement Concrete ◽  
Corrosive Media ◽  
Reinforcing Bar ◽  
Wire Beam Electrode ◽  
The Impact

The corrosion behavior of reinforcing bars in concrete was studied by simulating the 4×4 wire-beam electrode array. Different inhibitors were added to reinforced concrete. By measuring the open-circuit potential of an iron wire, the impact of different inhibitors on the corrosion of rebar in the concretes was studied after immersion in NaCl solution. The result showed that best protection was achieved by adding NaNO2 and aniline as inhibitors jointly to the concrete, as this combination maintained the open-circuit potential within the passivation range at all times, so ensuring the integrity of the passive membrane. By addition of this combination of the inhibitors, the compactibility of the cement concrete structure can be increased, thereby protecting the reinforcing bar against the external corrosive media.

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