Composition, structure, and corrosion resistance in dilute sulfur of a multicomponent coating in steel St3

1982 ◽  
Vol 24 (1) ◽  
pp. 28-30
Author(s):  
P. I. Ignatenko ◽  
N. E. Prodan ◽  
N. P. Ivanitsyn
Keyword(s):  
Corrosion Resistance ◽  
Multicomponent Coating ◽  
Composition Structure ◽  
Steel St3

Structure and Property of Micro Arc Oxidation Ceramic Coatings on Al Alloy in K2ZrF6 Solution

2010 ◽  
Vol 105-106 ◽  
pp. 505-508 ◽  
Author(s):  
Zhen Dong Wu ◽  
Zhong Wen Yao ◽  
Fang Zhou Jia ◽  
Zhao Hua Jiang
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Friction And Wear ◽  
Ceramic Coatings ◽  
Al Alloy ◽  
Structure And Property ◽  
Micro Arc Oxidation ◽  
Disk Friction ◽  
Composition Structure

The coatings containing zirconia were produced on LY12 Aluminium alloy by micro-arc oxidation in K2ZrF6 and NaH2PO2 solution. The composition, structure, hardness, friction and wear resistance and corrosion resistance of the coating were studied by XRD, SEM, EDS, ball-on-disk friction tester and electrochemical analyzer, respectively. The results show that coating was composed of m-ZrO2 and t-ZrO2. There were a large amount of Zr and O and a little Al, P and K in the coating. The thickness of coating prepared for 3h was 168μm and the maximum value of the hardness was up to 16.75GPa. The friction and wear resistance and corrosion resistance were improved, compared with the LY12 aluminium alloy substrate.

scholarly journals Diffusion Coatings as Corrosion Inhibitors

2016 ◽  
Vol 3 (1) ◽  
pp. 40-44
Author(s):  
Radoslav Ivanov ◽  
Tsveteslava Ignatova-Ivanova
Keyword(s):  
Corrosion Resistance ◽  
Diffusion Saturation ◽  
Metal Base ◽  
Diffusion Coatings ◽  
Diffusion Layers ◽  
Steel Container ◽  
Structure Thickness ◽  
Metal Products ◽  
Composition Structure ◽  
Harmful Effects

Abstract Corrosion is the cause of irretrievable loss of huge amounts of metals and alloys. The harmful effects of corrosion can be reduced significantly by applying appropriate methods of corrosion protection. One method to protect metals against corrosion is the formation of diffusion coatings on them. High corrosion resistance is typical for the boride diffusion layers. Aluminothermy is one of the main methods for diffusion saturation of the surface of metal products with various elements, including boron, and under certain conditions with aluminum, too. Samples of steel 45 were put to aluminothermic diffusion saturation with boron in a pressurized steel container at a temperature of 1100K, for 6 hours in powdered aluminothermic mixtures. The content of В2О3 in the starting mixtures decreased from the optimum - 20% to 0%, and the content of Al and the activator - (NH4)2.4BF3 is constant, respectively 7% and 0.5%. Al2O3 was used as filler. The borided samples were tested for corrosion resistance in 10% HCl for 72 hours. The results show that their corrosion resistance depends on the composition of the starting saturating mixture (mainly on the content of В2О3), and respectively on the composition, structure, thickness and degree of adhesion of the layer to the metal base.

scholarly journals A High-Performance Corrosion-Resistant Iron-Based Amorphous Metal - The Effects of Composition, Structure and Environment on Corrosion Resistance

2006 ◽  
Vol 985 ◽  
Author(s):  
Joseph Collin Farmer ◽  
J. Haslam ◽  
D. Day ◽  
T. Lian ◽  
C. Saw ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Passive Film ◽  
High Performance ◽  
Amorphous Metal ◽  
General Corrosion ◽  
Film Stability ◽  
Neutron Absorber ◽  
High Boron ◽  
Effective Neutron ◽  
Composition Structure

ABSTRACTThe passive film stability of several Fe-based amorphous metal formulations have been found to be comparable to that of high-performance Ni-based alloys, and superior to that of stainless steels, based on electrochemical measurements of the passive film breakdown potential and general corrosion rates. Chromium (Cr), molybdenum (Mo) and tungsten (W) provide corrosion resistance; boron (B) enables glass formation; and rare earths such as yttrium (Y) lower critical cooling rate (CCR). The high boron content of this particular amorphous metal also makes it an effective neutron absorber, and suitable for criticality control applications, as discussed in companion publications. Corrosion data for SAM2X5 (Fe49.7Cr17.7Mn1.9Mo7.4W1.6B15.2C3.8Si2.4) is discussed here.

Study of Micro-Arc Oxidation Process in Magnesium Surface

2012 ◽  
Vol 190-191 ◽  
pp. 595-598
Author(s):  
Ze Min Chen ◽  
Pin Lu ◽  
Qiu Hong Dong
Keyword(s):  
Corrosion Resistance ◽  
Constant Current ◽  
Constant Current Density ◽  
Oxidation Treatment ◽  
Test Pieces ◽  
Micro Arc Oxidation ◽  
Magnesium Surface ◽  
Hydroxyl Acid ◽  
Composition Structure

This study selected sodium silicate, sodium fluoride, glycerol hydroxyl acid, potassium hydroxide and phosphine oxide (LAP) as the stabilizer electrolyte, and then on micro-arc oxidation of magnesium with constant current density. The microstructure, corrosion resistance, chemical composition, structure and characterization of micro-arc oxidation film were determined by SEM and anodic oxidation methods. Experimental results indicated that the test pieces of magnesium would formed an silver-gray uniform densification oxide film on the surface by micro-arc oxidation treatment, and the corrosion resistance of magnesium film-formed had increased by potentiodynamic polarization curve testing.

Properties of Wrought CoNiCrMo Alloy Protasul-10, a Highly Corrosion and Fatigue Resistant Implant Material for Joint Endoprostheses

1980 ◽  
Vol 9 (4) ◽  
pp. 201-207 ◽  
Author(s):  
M Semlitsch
Keyword(s):  
Corrosion Resistance ◽  
State Of The Art ◽  
High Strength ◽  
International Standards ◽  
Clinical Use ◽  
Metallic Material ◽  
Implant Material ◽  
Stem Fracture ◽  
Composition Structure ◽  
Fatigue Fractures

Loosening of prosthetic components in the bone is a problem that has not been fully explored as yet. When loosening has occurred, the metallic anchorage stem may become overloaded and in extreme cases it may ultimately lead to stem fracture if the fatigue limit of the metallic material is exceeded. In order to preclude the possibility of these undesirable fatigue fractures of loosened prosthesis stems requiring re-operations, the Sulzer research laboratories have developed wrought alloys of extremely high strength and corrosion resistance such as Protasul-10.† The chemical composition, structure, mechanical properties, corrosion resistance and present state of the art of this implant material, which has been in clinical use since 1971, are specified in national and international standards.

Influence of potential on the structure and properties of microarc oxidation coating on Mg alloy

2008 ◽  
Vol 55 (5) ◽  
pp. 264-269 ◽  
Author(s):  
Deng Shu‐hao ◽  
Yi Dan‐qing ◽  
Gong Zhu‐qing ◽  
Su Yu‐chang
Keyword(s):  
Corrosion Resistance ◽  
Microarc Oxidation ◽  
Oxidation Potential ◽  
Structure And Properties ◽  
Micro Hardness ◽  
External Layer ◽  
X Ray Diffraction ◽  
Content Type ◽  
Constant Potential ◽  
Composition Structure

PurposeTo obtain an optimized microarc oxidation (MAO) coating on magnesium alloy from an environmentally‐friendly electrolyte free of Cr6 +  and PO43− and to investigate the influence of oxidation potential on the morphology, composition, structure, and other properties such as micro‐hardness and corrosion resistance.Design/methodology/approachA constant potential regime was applied to produce the coatings and scanning electron microscopy, energy dispersive spectroscope, X‐ray diffraction, hardness testing and electrochemical methods were used to study coating properties.FindingsThe results clearly show that oxidation potential plays an important role in the formation of coating structure and properties. The MAO coating is smooth and white and consists of two layers. The external layer is loose and porous and enriched in Al and Si. Moreover, the content of Al and Si increase with operated potential. The inner layer is compact and the content of Al and Si are lower than are those of the external layer. The coating is composed of several phases: the main phase is MgAl2O4/MgO, and the minor phase is Al2O3/SiO2 when the potential is higher. The micro‐hardness of the coating obtained a maximum at a potential of 45 V, as does the corrosion resistance.Originality/valueThis paper provides information relating to MAO technology and the morphology, structure and properties of MAO coatings.

scholarly journals The Electro-Spark Deposited WC-Cu Coatings Modified by Laser Treatment / Powłoki WC-Cu Naniesione Elektroiskrowo I Modyfikowane Obróbką Laserową

2015 ◽  
Vol 60 (4) ◽  
pp. 2579-2584 ◽  
Author(s):  
N. Radek ◽  
J. Konstanty ◽  
M. Scendo
Keyword(s):  
Corrosion Resistance ◽  
Laser Treatment ◽  
Sliding Friction ◽  
Protective Coatings ◽  
Structure Refinement ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
X Ray ◽  
Resistance Surface ◽  
Composition Structure

The main objective of the present work was to determine the influence of laser treatment on microstructure, X-ray diffraction, microhardness, surface geometric structure and roughness, corrosion resistance and tribological properties of coatings deposited on C45 carbon steel by the electro-spark deposition (ESD) process. The studies were conducted using WC-Cu electrodes produced by the powder metallurgy route. The tests show that the laser-treated electro-spark deposited WC-Cu coatings are characterized by higher corrosion resistance, surface roughness and seizure resistance which come at the expense of lower microhardness. The laser treatment process causes the homogenization of the chemical composition, structure refinement and healing of microcracks and pores of the electro-spark deposited coatings. Laser treated ESD coatings can be applied in sliding friction pairs and as protective coatings.

scholarly journals ZrN-ZrOxNy vs ZrO2-ZrOxNy coatings deposited via unbalanced DC magnetron sputtering

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gloria I. Cubillos ◽  
Eduard Romero ◽  
Adriana Umaña-Perez
Keyword(s):  
Corrosion Resistance ◽  
Magnetron Sputtering ◽  
Photoelectron Spectroscopy ◽  
Bone Cells ◽  
Electrochemical Impedance ◽  
Dc Magnetron Sputtering ◽  
X Ray ◽  
Composition Structure ◽  
Mouse Osteoblast ◽  
Steel Substrates

AbstractZrN-ZrO$${ }_{x}$$ x N$${ }_{y}$$ y and ZrO$${ }_{2}$$ 2 -ZrO$${ }_{x}$$ x N$${ }_{y}$$ y coatings were deposited on 316L stainless steel substrates via the unbalanced DC magnetron sputtering technique in order to improve their corrosion resistance and evaluate their possible use as a coating biocompatible with bone cells. The composition, structure, morphology, and corrosion resistance were studied by sum means of x-ray photoelectron spectroscopy (XPS), x-Ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The corrosion resistance was evaluated in 3.5 wt.% NaCl using potentiodynamic polarization (PL) and electrochemical impedance techniques (EIS). The ZrN-ZrO$${ }_{x}$$ x N$${ }_{y}$$ y and ZrO$${ }_{2}$$ 2 -ZrO$${ }_{x}$$ x N$${ }_{y}$$ y coatings exhibited barrier-type protection of the substrate against corrosion. The growth of mouse osteoblast cells was evaluated in the coating that exhibited the greatest resistance to corrosion, ZrO$${ }_{2}$$ 2 -ZrO$${ }_{x}$$ x N$${ }_{y}$$ y , finding that the cell viability was maintained, so this material can be considered to be a candidate for use in osteosynthesis processes.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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