Surface characterization and adhesion of black-oxide-coated copper substrate: effect of surface hardening processes

2004 ◽  
Vol 18 (9) ◽  
pp. 983-1001 ◽  
Author(s):  
Mohamed Lebbai ◽  
Jang-Kyo Kim ◽  
W.K. Szeto ◽  
Jingshen Wu
Keyword(s):  
Surface Hardening ◽  
Surface Characterization ◽  
Copper Substrate ◽  
Substrate Effect ◽  
Black Oxide ◽  
Effect Of Surface

On effect of surface hardening on impact and abrasive wear resistance of Hadfi eld steel

2020 ◽  
pp. 252-255
Author(s):  
V.I. Bolobov ◽  
V.S. Bochkov ◽  
E.V. Akhmerov ◽  
V.A. Plashchinsky ◽  
E.A. Krivokrisenko E.A.
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Work Hardening ◽  
Surface Hardening ◽  
Cold Work ◽  
Abrasive Wear Resistance ◽  
Hadfield Steel ◽  
Mining Equipment ◽  
Effect Of Surface

On the example of Hadfield steel, as the most common material of fast-wearing parts of mining equipment, the effect of surface hardening by plastic deformation on their impact and abrasive wear resistance is considered. Wear test is conducted on magnetic ironstone as typical representative of abrasive and hard rock. As result of wear of initial samples with hardness of ∼200 HB and samples pre-hardened with different intensities to the hardness of 300, 337 and 368 HB, it is found that during the initial testing period, the initial samples pass the “self-cold-work hardening” stage with increase in hardness to ∼250 HB, which remains virtually unchanged during further tests; the hardness of the pre-hardened samples does not change significantly throughout the tests. It is established that the rate of impact-abrasive wear of pre-hardened samples is significantly (up to 1.4 times) lower than the original ones that are not subjected to plastic deformation, and decreases with increasing degree of cold-work hardening. Preliminary surface hardening by plastic deformation can serve as effective way to increase the service life of fast-wearing working parts of mining equipment.

scholarly journals Corrosion prevention of commercial alloys by air-water interface grown, edge on oriented, ultrathin squaraine film

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Rajiv Kumar Pandey ◽  
Richa Mishra ◽  
Gopal Ji ◽  
Rajiv Prakash
Keyword(s):  
Corrosion Protection ◽  
Surface Characterization ◽  
Electrochemical Techniques ◽  
Copper Substrate ◽  
Chemical Properties ◽  
Copper Surface ◽  
Ultrathin Film ◽  
Water Interface ◽  
Acid Media ◽  
Air Water Interface

Abstract Copper is one of the most demanded commercial metal/alloys in world market. The demand for copper in industries such as electrical, electronics, automobile, telecommunications, defence, etc. as well as in daily life has escalated in the recent years due to its versatile physical and chemical properties. However destruction of copper surface by any means, preferably corrosion, can limit its vast application. For protection from corrosion, various techniques are used to coat metal substrates with passivating materials. These techniques are either complex as well as expensive, or provide incomplete protection in acid media. To address these issues, floating film transfer method (FFTM) is utilized in this work for obtaining ultrathin film of squaraine (passivating molecule) as well as their easy and fast transfer over copper substrate. The squaraine film is deposited on copper substrate in layers, viz., 1 to 4 layers. The corrosion behavior is examined in 0.1 M HCl using electrochemical techniques as well as surface characterization techniques, which portray that copper corrosion is hampered in harmony with the layers deposited. Nearly 40% corrosion protection is reached for copper coated with 1 layer of squaraine. However, the protection is amplified up to 98% with 4 layers of squaraine, which clearly substantiates the supremacy of this coating method over reported methods of protection. This technique and the material (squaraine) are both for the first time being used in the field of corrosion protection. The easy growth of ultrathin film at air-water interface as well as its rapid transfer over substrate promotes use of FFTM for efficient corrosion protection on industrial scale.

scholarly journals Effect of Surface Hardening on Dynamic Frictional Rolling Contact Behavior and Degradation of Corrugated Rail

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yuan Gao ◽  
Jingmang Xu ◽  
Ping Wang ◽  
Yibin Liu
Keyword(s):  
Surface Hardening ◽  
Matrix Material ◽  
Rolling Contact ◽  
Superposition Method ◽  
Wear Depth ◽  
Plasma Surface ◽  
Contact Behavior ◽  
Rail Wear ◽  
The Matrix ◽  
Effect Of Surface

The present study was undertaken to evaluate the effect of surface hardening technology on dynamic frictional rolling contact behavior and degradation of corrugated rail in Shenzhen. Characteristic parameters such as length and depth of corrugation were analyzed by means of a continuous measurement method based on the corrugation analysis trolley. The explicit finite element method for material hardening characteristics and real contact geometry was adopted to set up the 3D transient FE model of wheel and rail, after which the value and distribution of stress/strain as well as contact solutions could be obtained during frictional contact, and then the Archard wear model and simplified wear superposition method are integrated as a numerical simulation tool for rail wear after hardening. The simulation results show that laminar plasma surface hardening technology can increase residual stress and shear stress in quenched zones, leading to local stress concentration at their boundaries; the plastic strain in the matrix material is higher than that in the quenched zones, while the strain concentration is mainly focused on the matrix material. The hardening can remarkably reduce the rail wear along the corrugation wave, and the wear depth of material with hardening technology is about 36% of that of nonhardening material. Laminar plasma surface hardening technology can therefore restrain the development of rail corrugation.

Effect of Surface Hardening Technique and Case Depth on Rolling Contact Fatigue Behavior of Alloy Steels

2014 ◽  
Vol 58 (2) ◽  
pp. 215-224 ◽  
Author(s):  
Lechun Xie ◽  
David Palmer ◽  
Frederick Otto ◽  
Zhanjiang Wang ◽  
Q. Jane Wang
Keyword(s):  
Surface Hardening ◽  
Fatigue Behavior ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Case Depth ◽  
Rolling Contact ◽  
Alloy Steels ◽  
Effect Of Surface

Effects of surface treatments on changes in low-voltage SEM of polymers

1991 ◽  
Vol 49 ◽  
pp. 1038-1039
Author(s):  
J. Chang ◽  
S. Krause ◽  
W. Adams
Keyword(s):  
Surface Treatment ◽  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Low Voltage ◽  
Beam Current ◽  
Polymer Surfaces ◽  
Powder Sintering ◽  
Good Potential ◽  
Effect Of Surface ◽  
Surface Changes

The effects of surface treatment of polymers is important in many areas of technology. Polymer surfaces may be treated for a variety of reasons including: increased wettability for printing; improved fiber bonding in composites; and improved bonding in powder sintering. A variety of techniques are used to study surface changes after treatments including hydrophobicity, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Another technique which has good potential for surface characterization is the effect of surface treatment on the crossover voltage, “E2,” in low voltage SEM. E2 is the accelerating voltage at which there is 0 potential on surface of an insulator because the electron emission current is equal to the primary beam current. We have previously demonstrated that changes in E2 are correlated to changes in hydrophobicity. These results also correlated well with XPS and weight loss measurements. In this research we are reporting on the effects of surface roughness, chemical treatment and electrical discharges on changes in E2 for teflon (polytetrafluoroethylene).

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