Synthesis of molten-metal corrosion resistant yttria-based refractory by hot-pressing and densification

2015 ◽  
Vol 35 (9) ◽  
pp. 2651-2662 ◽  
Author(s):  
Son Thanh Nguyen ◽  
Tadachika Nakayama ◽  
Hisayuki Suematsu ◽  
Tsuneo Suzuki ◽  
Makoto Nanko ◽  
...  
Keyword(s):  
Molten Metal ◽  
Hot Pressing ◽  
Metal Corrosion ◽  
Corrosion Resistant

scholarly journals REGULARITIES OF CREATION OF LAYERED METAL CORROSION-RESISTANT MATERIALS WITH INTERNAL PROTECTOR

2020 ◽  
pp. 24-30
Author(s):  
I. S. Los’ ◽  
A. E. Rozen ◽  
A. V. Dub ◽  
A. E. Korneev ◽  
S. Yu. Kireev ◽  
...  
Keyword(s):  
Systematic Approach ◽  
Layered Materials ◽  
Explosion Welding ◽  
Metal Corrosion ◽  
Corrosion Resistant ◽  
Protective Layers ◽  
System A ◽  
Bimetallic Materials ◽  
First Time ◽  
Internal Protector

In this article regularities of the creation of laminated metal corrosion-resistant materials with an internal protector obtained by explosion welding are considered. For the first time, a laminated material is considered as a technical system. A systematic approach was used to construct the configuration of layered materials. The functions of individual elements are identified, the nature of the connections is established, and the complexity of the system is assessed. Corrosion tests were carried out, indicators of corrosion resistance were calculated by varying the number of protected and protective layers in comparison with monometallic material. An assessment of the economic efficiency of using laminated metal corrosion-resistant materials with an internal protector is carried out in comparison with monometallic and bimetallic materials.

Corrosion Resistant, Lightweight, and Inexpensive Metallic Bipolar Plates With Excellent Manufacturability for PEM Fuel Cell Power Systems

2004 ◽  
Author(s):  
Yue Hung ◽  
K. M. El-Khatib ◽  
Hazem Tawfik
Keyword(s):  
Fuel Cell ◽  
Room Temperature ◽  
Experimental Testing ◽  
Single Cells ◽  
Pem Fuel Cell ◽  
The Other ◽  
Metal Corrosion ◽  
Bipolar Plates ◽  
Active Electrode ◽  
Corrosion Resistant

Corrosion resistant metal treated bipolar plates with higher rigidity and electrical conductivity than graphite were developed and tested for PEM fuel cell applications. Six replicas of single cells, three of which were made of graphite composites bipolar plates and the other three were made of the treated metallic plates. An Electrode Membrane Assembly (MEA) with 5.55 cm2 active electrode areas, double-sided electrodes, 0.3 mg/cm2 Pt loading and Nafion membrane 115 was fitted to each cell and operated under identical conditions. The experimental testing was conducted at room temperature 20°C. The obtained data from the three graphite cells were averaged and plotted and the other metallic cells’ data were similarly treated and plotted on the same graph for comparison. Generally, the metallic treated bipolar plate provided at least 12% saving in hydrogen consumption in comparison to graphite. This is attributed to the lower bulk and surface contact resistance of the metal used in this study in relation to graphite. The results of the lifetime testing, conducted at room temperature under variable loading showed no indication of power degradation due to metal corrosion for at least 1500 hours.

scholarly journals Issue of technological equipment corrosion at chemical wood processing enterprises (review)

2021 ◽  
Vol 25 (3) ◽  
pp. 142-151
Author(s):  
G.L. Oliferenko ◽  
◽  
A.N. Ivankin ◽  
A.V. Ustyugov ◽  
A.N. Zarubina ◽  
...  
Keyword(s):  
Acid Corrosion ◽  
External Source ◽  
Metal Corrosion ◽  
Chemical Processing ◽  
Technological Equipment ◽  
Corrosion Resistant ◽  
Wood Processing ◽  
Anodic Protection ◽  
Equipment Corrosion ◽  
Industrial Use

The review is devoted to the problem of corrosion in the chemical processing of wood. Corrosion processes of technological equipment at enterprises of the pulp and paper, hydrolysis and wood chemical industries are considered. The influence of the main chemical substances involved in the technological process or formed during the chemical processing of wood is discussed. The importance of using alloyed, corrosion-resistant steels of grades 10Kh17N13M2T, 10Kh17N13M3T, 08Kh17N15M3T in the processes of chemical transformation is shown. The information on methods of protection of structural materials from corrosion at enterprises in recent years is presented. The prospects of industrial use of the method of anodic protection, which consists in creating a passivating film on the surface of the protected structure by anodic polarization from an external source of direct current, is noted. The importance of using inhibitors in the composition of technological media is discussed, as one of the most effective ways to combat metal corrosion in aggressive media. It is noted that in addition to the well-known inhibitors of acid corrosion KI-1, PB-5, PKU-3, KhOSP-10, urotropin, KPI-3, I-1-V, BA-6, the use of green chemistry advances is promising, in particular, the use of as anticorrosive agents for waste processing of both wood itself and corrosion inhibitors based on plant extracts.

Effect of Super-Hydrophobic Surface on the Corrosion Performance of Copper and Copper Alloys

2013 ◽  
Vol 864-867 ◽  
pp. 447-450 ◽  
Author(s):  
Jie Han ◽  
Qun Jie Xu ◽  
Guo Li Zhang ◽  
Mei Ming Li
Keyword(s):  
Surface Treatment ◽  
Copper Alloys ◽  
Hydrophobic Surface ◽  
Metal Corrosion ◽  
Economic Losses ◽  
Copper Corrosion ◽  
Corrosion Performance ◽  
Corrosion Resistant ◽  
Construction Methods ◽  
Recent Developments

With copper and copper alloys widely used, copper corrosion has already caused huge economic losses. Super-hydrophobic surface treatment, a new kind of corrosion resistant technology, can effectively inhibit metal corrosion. This paper introduces the basic issues and the construction methods of copper and copper alloys super-hydrophobic surface. The effect of super-hydrophobic surface on the corrosion performance of copper and copper alloys is analyzed emphatically. Recent developments of super-hydrophobic surface and the existed technical barriers are also summarized in the paper.

Corrosion-resistant ZSM-5 zeolite coatings formed on Mg–Li alloy by hot-pressing

2011 ◽  
Vol 53 (5) ◽  
pp. 1732-1737 ◽  
Author(s):  
Dalei Song ◽  
Xiaoyan Jing ◽  
Jun Wang ◽  
Yanli Wang ◽  
Piaoping Yang ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Corrosion Resistant ◽  
Zeolite Coatings

Testing and Evaluation of Aluminum Coated Bipolar Plates of PEM Fuel Cells Operating at 70° C

2005 ◽  
Author(s):  
Yue Hung ◽  
Hazem Tawfik
Keyword(s):  
Single Cells ◽  
Bipolar Plate ◽  
Pem Fuel Cells ◽  
The Other ◽  
Metal Corrosion ◽  
Carbon Cloth ◽  
Bipolar Plates ◽  
Active Electrode ◽  
Corrosion Resistant ◽  
Aluminum Plates

Corrosion resistant metal treated bipolar plates with higher rigidity and electrical conductivity than graphite were developed and tested for PEM fuel cell applications. Six replicas of single cells were fabricated; two of graphite composites bipolar plates and the other four plates were coated aluminum. Two different high corrosion resistant coatings were used in this study and were applied to each pair of the metallic plates. An E-TEK Series 14-W MEA with carbon cloth GDL, thickness of Nafion <50 microns, <1mg/cm^2 total platinum content (anode & cathode) and 6.45 cm2 active electrode areas, was fitted to each cell and operated under identical conditions. The obtained data from the two graphite cells were averaged and plotted and the other aluminum cells’ data were similarly treated and plotted on the same graph for comparison. Generally, the metallic treated bipolar plate provided at least a 22% savings in hydrogen consumption in comparison to graphite. This is attributed to the lower bulk and surface contact resistance of the coated aluminum plates used in this study in relation to graphite. The results of the lifetime testing conducted at temperature of 70° C under loading condition ranging from 0 to 0.6 W that showed no indication of power degradation due to metal corrosion for at least 60 hours.

Physical, Chemical, and Crystallographic Characterization of Anodic Coatings on High Strength Aluminum Base Alloys

1976 ◽  
Vol 34 ◽  
pp. 636-637
Author(s):  
R. E. Herfert ◽  
N. T. McDevitt
Keyword(s):  
Sulfuric Acid ◽  
Salt Spray ◽  
High Strength ◽  
Environmental Stability ◽  
Anodic Films ◽  
Sodium Dichromate ◽  
Corrosion Resistant ◽  
Aerospace Applications ◽  
Bond Strengths ◽  
Adhesive Bonded Joints

Durability of adhesive bonded joints in moisture and salt spray environments is essential to USAF aircraft. Structural bonding technology for aerospace applications has depended for many years on the preparation of aluminum surfaces by a sulfuric acid/sodium dichromate (FPL etch) treatment. Recently, specific thin film anodizing techniques, phosphoric acid, and chromic acid anodizing have been developed which not only provide good initial bond strengths but vastly improved environmental durability. These thin anodic films are in contrast to the commonly used thick anodic films such as the sulfuric acid or "hard" sulfuric acid anodic films which are highly corrosion resistant in themselves, but which do not provide good initial bond strengths, particularly in low temperature peel.The objective of this study was to determine the characteristics of anodic films on aluminum alloys that make them corrosion resistant. The chemical composition, physical morphology and structure, and mechanical properties of the thin oxide films were to be defined and correlated with the environmental stability of these surfaces in humidity and salt spray. It is anticipated that anodic film characteristics and corrosion resistance will vary with the anodizing processing conditions.

Microstructure of mechanically alloyed and hot-pressed Al5CuZr2

1990 ◽  
Vol 48 (4) ◽  
pp. 970-971
Author(s):  
T. E. Mitchell ◽  
P. B. Desch ◽  
R. B. Schwarz
Keyword(s):  
Mechanical Alloying ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Rapid Quenching ◽  
Hardened Steel ◽  
Alloyed Powder ◽  
Ion Milling ◽  
Mechanical Grinding ◽  
Mechanically Alloyed ◽  
Steel Container

Al3Zr has the highest melting temperature (1580°C) among the tri-aluminide intermetal1ics. When prepared by casting, Al3Zr forms in the tetragonal DO23 structure but by rapid quenching or by mechanical alloying (MA) it can also be prepared in the metastable cubic L12 structure. The L12 structure can be stabilized to at least 1300°C by the addition of copper and other elements. We report a TEM study of the microstructure of bulk Al5CuZr2 prepared by hot pressing mechanically alloyed powder.MA was performed in a Spex 800 mixer using a hardened steel container and balls and adding hexane as a surfactant. Between 1.4 and 2.4 wt.% of the hexane decomposed during MA and was incorporated into the alloy. The mechanically alloyed powders were degassed in vacuum at 900°C. They were compacted in a ram press at 900°C into fully dense samples having Vickers hardness of 1025. TEM specimens were prepared by mechanical grinding followed by ion milling at 120 K. TEM was performed on a Philips CM30 at 300kV.

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