Resistance to Electrochemical Reactions at Rust Layers Formed at the Defective Part of the Coating of Thermal Al-Si Alloy Spray Coated Steel Plates and the Adhesive Strength of the Coatings

In order to investigate the effectiveness of laser quenching for ceramic coated steels, 2 kinds of ceramic coated specimens of CrAlN and TiAlN were prepared, and the laser quenching experiments under various irradiation conditions were carried out. The influence of laser irradiation on the substrate hardness, film hardness and adhesive strength were investigated. Because of the high heat absorption of CrAlN and TiAlN films when compared to TiN, it was possible to quench the substrate effectively without any absorbent material for these specimens, although an absorbent was required for TiN coated specimen. The quenched area on the cross section of the substrate of CrAlN coated specimen was larger than that of TiAlN coated specimen. The difference of the quenched area could be explained by the difference of the heat absorption of these films. It was also possible to improve the adhesive strength of these films by laser irradiation. Although the film hardness decreased considerably by furnace quenching for ceramic coated steels, film hardness did not decrease by laser irradiation. It was concluded that the improvement of the adhesive strength and substrate hardness without the decrease of film hardness was achieved by laser quenching for CrAlN and TiAlN coated specimens.

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Resistance welding of coated steel plates in the aspect of environmental conditions

The Paton Welding Journal ◽

10.15407/tpwj2016.06.27 ◽

2016 ◽

Vol 2016 (6) ◽

pp. 153-160

Author(s):

J. Matusiak ◽

◽

J. Wycislik ◽

Keyword(s):

Environmental Conditions ◽

Steel Plates ◽

Resistance Welding ◽

Coated Steel

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Numerical and Experimental Study on the Locally Blast Loaded Polyurea Coated Steel Plates

Materiale Plastice ◽

10.37358/mp.19.3.5216 ◽

2019 ◽

Vol 56 (3) ◽

pp. 492-499

Author(s):

Florina Bucur ◽

Eugen Trana ◽

Adrian Rotariu

Keyword(s):

Experimental Tests ◽

Cost Effective ◽

Experimental Results ◽

Steel Plates ◽

Coated Steel ◽

Quick Response ◽

Blast Mitigation ◽

Private Research ◽

Set Up ◽

Research Facilities

The damages and casualties inflicted by mine and IED attacks in security challenging areas generated a strong and quick response from nations all over the world. As a part of this response several national and private research facilities increased their efforts in identifying and implementing new ways or technologies to enable blast wave mitigation. The current paper aim to investigate the opportunity of using polyurea coated steel plates as a possible new blast mitigation approach, as suggested by several investigators. In order to objectively conclude about the ability of polyurea coated plates to sustain locally blast loads several experimental tests were performed according to STANAG 4569 demands for a 1/6 scaled plate structure. In order to numerically validate the experimental results several Autodyn simulations were set-up. The numerical and experimental results exibits a fair correlation, both pointing towards a dismiss of the idea of using polyurea coated steel plates as structural and cost effective blast mitigation approach.

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Investigation on the Corrosion of Coated Steel Plates with Impact Defect using Divided Steel Plates

Civil Engineering Journal ◽

10.28991/cej-030968 ◽

2018 ◽

Vol 4 (1) ◽

pp. 58 ◽

Cited By ~ 1

Author(s):

Marish S. Madlangbayan ◽

Nobuaki Otsuki ◽

Takahiro Nishida ◽

Tsuyoshi Saito

Keyword(s):

Polarization Resistance ◽

Steel Plates ◽

Coated Steel ◽

Test Results ◽

Nacl Solution ◽

Half Cell ◽

Cell Potential ◽

Polarization Behavior ◽

The Impact ◽

Macrocell Corrosion

A method utilizing divided steel plates was used to investigate the corrosion of coated steel plates with impact defect while continuously submerged in 3% NaCl solution. The polarization behavior of circular divided steel plates was first compared to that of undivided ones. Half-cell potential and polarization resistance results show similar trend in divided and undivided form especially at the later stages of exposure. The method of using circular divided steel plates was then used to monitor the macrocell as well as microcell corrosion in coated steel plates induced with defect. The test results show that the defect causes macrocell corrosion to occur between the defect and sound portions. The impact defect also caused the reduction in the polarization resistance and consequently higher microcell corrosion at the neighbouring sound coated portions.

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ICE ADHESION

Canadian Journal of Physics ◽

10.1139/p62-138 ◽

1962 ◽

Vol 40 (10) ◽

pp. 1294-1309 ◽

Cited By ~ 43

Author(s):

H. H. G. Jellinek

Keyword(s):

Stainless Steel ◽

Adhesive Strength ◽

Viscosity Coefficient ◽

Interfacial Free Energy ◽

Steel Plates ◽

Shear Tests ◽

Viscosity Coefficients ◽

Water Films ◽

Yield Values ◽

Steel Surfaces

Results of shear tests for the system ice – stainless steel and ice – optically flat fused quartz as a function of the rate of shear and roughness of the steel surfaces are presented. The adhesive strength decreased with decreasing roughness of steel surfaces, and the force versus time curves for smooth steel plates resembled those of two solids sliding over each other with a liquid layer between them. This behavior was especially evident in the case of the optically flat quartz. The adhesive strength as a function of rate of shear was linear for both ice – stainless steel and ice – quartz but there were indications of yield values. The results agree with the assumption of a liquidlike layer on ice. Ratios of viscosity coefficient to layer thickness were evaluated for both systems, and viscosity coefficients are estimated. Shear experiments on thin water films between glass plates support the assumption of a liquidlike layer on ice. The importance of interfacial free energy considerations is pointed out.

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