Research Status and Prospects of Surface Nanocrystalline Technology of the Metal Materials

2011 ◽  
Vol 239-242 ◽  
pp. 2972-2975
Author(s):  
Yong Hua Sheng
Keyword(s):  
Corrosion Resistance ◽  
Industrial Production ◽  
Preparation Method ◽  
Abrasive Resistance ◽  
Research Status ◽  
Comprehensive Properties ◽  
Metal Materials ◽  
Modern Industry

The metal materials play important roles in the area of the industry. So it is meanful to use some technologies to improve the comprehensive properties of the metal materials. Comparing with other methods, the surface nanocrystalline technology can improve the strength, the hardness, the abrasive resistance and the corrosion resistance of the metal materials. Besides, through the surface nanocrystalline technology, the grain of the organization can be refined, and the lifespan of the fatigue can be prolonged. So, the surface nanocrystalline technology is with widely market application prospect. At present, there are many studies about the surface nanocrystalline technology, and many typical technologies have been applicated in the industrial production successfully, which satisfy the high requirement of the modern industry in some extent. In this article, the principle, the preparation method and the research status of the surface nanocrystalline technology are produced, and the prospection are made.

Industrial Application of Pb–Ag–Ca Anode with Surface Passivation for Zinc Electrowinning

2014 ◽  
Vol 941-944 ◽  
pp. 1398-1401
Author(s):  
Jian Huang ◽  
Yuan Fa Ding ◽  
Xiang Dong Su ◽  
Yong Li ◽  
Yong Sheng Xiong ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Industrial Application ◽  
Industrial Production ◽  
Surface Passivation ◽  
Production Costs ◽  
Zinc Electrowinning ◽  
Alloy Anode ◽  
Detection And Tracking

The Pb–Ag–Ca alloy anode with surface passivation was applied in industrial production of zinc electrowinning. The application situation was investigated by detection and tracking more than 3 months. The results were analyzed by comparison with the data acquired from the production using the reference anodes without surface treatment. The results showed that using the anode with surface passivation can increase zinc yield, reduce Pb content in zinc product, prolong the anode life by improving the corrosion resistance, and then reduce the production costs.

scholarly journals Corrosion and Wear Behavior of PEO Coatings on D16T Aluminum Alloy with Different Concentrations of Graphene

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 249
Author(s):  
Wanying Liu ◽  
Yi Pu ◽  
Hongcheng Liao ◽  
Yuanhua Lin ◽  
Wanying He
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Wear Behavior ◽  
Corrosion And Wear ◽  
Plasma Electrolyte ◽  
Comprehensive Properties ◽  
Α Al2o3 ◽  
Plasma Electrolyte Oxidation ◽  
Peo Coatings

The effect of added graphene concentration on the microstructure, phase composition, corrosion- and wear- resistance of plasma electrolyte oxidation (PEO) coatings formed on D16T aluminum alloy in silicate electrolyte with different concentrations of graphene were investigated. The results show that the morphologies of the coatings with graphene were obviously different ascribed to the mode of graphene incorporated into the coating. The coatings consisted of mainly α-Al2O3, γ-Al2O3, and Al, which were divided into an outer porous layer and a dense inner layer. The thickness of the coatings increased non-linearly with graphene concentration. The corrosion resistance of the coatings with graphene was significantly improved. The wear resistance of the coatings was also greatly improved apart from the coating with 3 g/L graphene. The coating produced in the electrolyte with 2 g/L graphene exhibited the optimal comprehensive properties because graphene successfully incorporated into the coating via the pores and spread on the surface of the coating.

Influence on Rare Earth Re3+ by the Performance of Composite Brush Plating of Ni-P

2014 ◽  
Vol 940 ◽  
pp. 7-10
Author(s):  
Zhong Bao Jiang ◽  
Yu Feng Zhang ◽  
Shao Li Duan ◽  
Shou Liang Cao
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Sodium Citrate ◽  
High Hardness ◽  
Abrasive Resistance ◽  
Binding Force ◽  
Plating Method ◽  
Low Phosphorus ◽  
Brush Plating ◽  
Plating Layer

Using the sodium citrate as ligands and adopting electric brush plating method, Re will be deposited together with Ni-P from the solution, and a complex brush plating of Ni-P-Re can be attained. It is discussed the effect of the rare earth Re3+ on the deposition rate, corrosion resistance and bonding strength of the Ni-P composite brush plating. Adding some appropriate Re3+ to the brush plating solution, the amorphous tissue can be obtained under the condition of the low phosphorus brush plating, which make the brush plating layer with high hardness and high abrasive resistance at the same time, binding force and corrosion resistance are improved, and greatly improve the performance of the brush plating.

Progress of High Purity Magnesium Oxide Preparation

2014 ◽  
Vol 525 ◽  
pp. 62-65 ◽  
Author(s):  
Bi Jun Luo ◽  
Dan Wu ◽  
Li Cong Wang ◽  
Xi Ping Huang
Keyword(s):  
Magnesium Oxide ◽  
High Purity ◽  
Preparation Method ◽  
Preparation Methods ◽  
Domestic Production ◽  
Research Status ◽  
Development Direction

The research status of high purity magnesium oxide preparation is introduced in this paper. First, process for preparing high purity MgO is summarized, the global and domestic production status of high purity magnesia is also described. Finally, the problems and disadvantages of current MgO preparation methods are concluded, also development direction of preparation method basing on brine utilization in the production of MgO is put forward.

scholarly journals Corrosion survey of the palm greenhouse support structure in the castle garden in Lány

2019 ◽  
Vol 63 (1) ◽  
pp. 54-64
Author(s):  
P. Pokorný ◽  
M. Hrabánek ◽  
D. Dvorský ◽  
L. Turek
Keyword(s):  
Corrosion Resistance ◽  
Cast Iron ◽  
Chemical Composition ◽  
Point Of View ◽  
Coating System ◽  
Current State ◽  
Steel Cast ◽  
Metal Materials ◽  
Static Point ◽  
Applied Coating

Abstract The corrosion survey of the supporting steel/cast iron structure of the palm greenhouse included not only the characteristics of the used metal materials (microstructure, chemical composition), but also the current state of the system of corrosion protection (thickness and stratigraphy of the applied coating system). From a static point of view, the palm greenhouse design meets the applicable standards if two damaged cast iron columns are repaired. A new top coat with extended corrosion resistance is required on the surface of individual metal profiles.

scholarly journals Effect of Solution Treatment Temperature on Microstructural Evolution, Precipitation Behavior, and Comprehensive Properties in UNS S32750 Super Duplex Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1481
Author(s):  
Junhe Li ◽  
Wei Shen ◽  
Ping Lin ◽  
Fuming Wang ◽  
Zhanbing Yang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Element Distribution ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Σ Phase ◽  
Comprehensive Properties

The changes of microstructures, element distribution, and comprehensive properties were studied to explore their interactions with each other, induced by solution treatment of UNS S32750 super duplex stainless steel. The results showed that the ferrite content improved, while the austenite content declined as the temperature increased. From 900 to 1000 °C, the σ phase existing at α/γ grain boundaries and in ferrite grains gradually dissolved. At 1050 °C, the microstructures consisted of only ferrite and austenite. From 1050 to 1300 °C, the Cr2N precipitated in ferrite and gradually grew and coarsened. The impact energy and pitting potential of UNS S32750 first improved and then weakened, while the hardness is the opposite, owing to the combined effects of element distribution, microstructures, and precipitates. In the presence of the σ phase, the corrosion resistance and mechanical properties of UNS S32750 correspond directly to the σ phase fraction. Subsequently, the rise in temperature promoted γ → α phase transformation, and the elements partitioning ratios of Cr and Mo declined, resulting in reduced toughness and corrosion resistance and a rise in hardness. Consequently, when the solution treatment temperature is 1050 °C, the α/γ ratio of UNS S32750 approached 1:1, with excellent overall properties.

Effect of Additives on Ash Corrosion on Heat Exchanging Surface of Biomass Boilers

2020 ◽  
Vol 837 ◽  
pp. 95-101
Author(s):  
Yu Sun ◽  
Yong Zheng Wang ◽  
Ke Zhang ◽  
Yun Gang Li
Keyword(s):  
Corrosion Resistance ◽  
Silica Fume ◽  
Coal Ash ◽  
Pulverized Coal ◽  
Ash Deposition ◽  
Alkali Metal Chloride ◽  
Obvious Effect ◽  
Biomass Boiler ◽  
Metal Materials ◽  
Better Than

This paper focuses on the problems of ash deposition and corrosion caused by alkali metal chloride in biomass boiler. Kaolin, pulverized coal ash, silica fume, dolomite, limestone and bauxite are used as additives in this study, to investigate the degree of corrosion of four metal materials on biomass boiler. The results show that the corrosion rate of metal samples is significantly reduced after adding additives. Kaolin, pulverized coal ash, silica fume and bauxite show much obvious effect on corrosion inhibition. Corrosion resistance of four pipe metals: T91>15CrMoG>12CrMoVG>20G, in which the corrosion resistance of T91 is much better than the other three metals.

The Present Situation and Progress of Vibration Environment Test Technology

2014 ◽  
Vol 986-987 ◽  
pp. 1696-1699
Author(s):  
Yuan Ding Xing ◽  
Hai Qian ◽  
Ying Cheng Peng ◽  
Bao Liang Zhu ◽  
Meng Huang
Keyword(s):  
Performance Index ◽  
Present Situation ◽  
Processing Technology ◽  
Test Equipment ◽  
Research Status ◽  
Test Technology ◽  
Vibration Measuring ◽  
Technology Structure ◽  
Modern Industry

This paper reviews the research status of vibration environment test equipment and technology. The development of modern vibration measuring sensors, types, processing technology, structure principle and the main performance index of the sensor is made by brief introduction and analysis, the problems existing in the vibration environment test is pointed out, at the same time for their application in the field of modern industry be also made by corresponding introduction.

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