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1

The analysis of the electrode potential shift in the examination of plastic-covered metal fatigue strength

Jamroziak K., Jargulinski W.

Archives of Materials Science and Engineering

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2010

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Vol. 41, nr 1

21-27

EN

Purpose: A development of methodology of adhesive force measuring, and at the same time an estimation of its value change in the specifically designated group of materials that are used in technical objects' construction, requires defining the fatigue strength value changes. The one of the elements influencing adhesive force is electrode potential estimation in the relation to the function of adhesive force considering variable layers of the coatings. Design/methodology/approach: This paper describes an issue of electrode potential shift influence on metals' fatigue strength. The issue was presented based on the literature and conducted tests. Findings: The results of the examinations concern electrode potential shift influence on adhesion forces' increase in the materials covered with various coatings in relation to a defined coating thickness. Research limitations/implications: After earlier made tests, when it was forecast that electrode potential influences an increase in fatigue strength. It was formulated for verification of the assumed hypothesis. The tests were conducted on samples of selected metals coated with various configurations of layers. The methodology was limited to the measurement of the research results with a single kind of demonstration (standard) electrode. Practical implications: The results of the tests, in shape of charts representing the shift of electrode potential in relation to time, will allow the authors to resolve next research problem to describe a mechanism of hydrogen absorption by a metal base. This will allow to develop methodology of moist (damp) angle measure. The angle influences adhesion force that is responsible for an increase in fatigue strength. Originality/value: The value of attained results will help to develop general assumptions for methodology of moist (damp) angle measure.

2

Electrical double layer and adhesive force in fatigue strength of metals coated with plastics

Jamroziak K., Jargulinski W.

Archives of Materials Science and Engineering

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2009

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Vol. 36, nr 2

82-88

EN

Purpose: Literature consists a lot of information concerning the issues of the fatigue endurance of metals coated with plastics. However few studies explicitly explain, what mechanisms decide on the increased fatigue endurance of metals coated with plastics. Therefore an expression is a purpose of the work on what a way increasing this fatigue endurance permanence is taking a place. Design/methodology/approach: In hereby article they discussed issues concerning the fatigue endurance of metals coated with plastic. Authors are putting the thesis on the basis of an analysis of literature and own examinations, that metals coated with material are characterized by an increased fatigue endurance. Findings: On the basis of results conclusions concerning raising the fatigue endurance permanence of some coated metals were deduced from an experiment with material. Research limitations/implications: Examinations were concentrated only on determining the influence of the electrode potential and power of adhesion on metal samples (steel 20 and 45) covered with different coatings. To the purpose of demonstrating the increased fatigue endurance permanence of analyzed samples they limited themselves to experiments taking into consideration the strength to turning and bending. Practical implications: Get results of research are broadening their knowledge of the scope of changes of the fatigue strength of metals coated with plastic. Originality/value: Authors are making a demand that the considerable increase of the fatigue endurance permanence of tested samples is caused with influence of electric double layer by adhesive force of the coating to metal.

3

The electric double layer in hydriding metals

Jamroziak K., Jargulinski W., Szelka J.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 31, nr 2

678-682

EN

Purpose: The effect of penetration hydrogen into fatigue load metals is widely investigated by many researchers. Hydrogen is the chemical element which plays negative role in fatigue durability of structures. It decides on fatigue brittle cracking. In the paper authors carry out an analysis of fatigue durability. Making use of naturally coming into existence the electric double layer phenomenon authors discussed the model of absorbing hydrogen into fatigue gap. Design/methodology/approach: A proposed model of the mechanism of hydrogen absorption by metal was based on particle hydrogen and water vapor from the air. Findings: It assumes that the EDL has crucial role in intercepting of polar dipole particles of hydrogen and water's vapor, especially in an already formed fatigue micro-gaps and gaps by effects of its electrostatic attraction force. The authors assume that the main source of hydrogen is water's vapor, and number of hydrogen dipoles is negligible. Practical implications: The problems of metals fragility/durability were also discussed in other papers in which author mainly tried to develop new methods of materials production with the consideration of assumed fatigue durability. Originality/value: Currently, in progress are works on proposing a model for hydrogen absorption by metal. Such approach to optimization in production and development of the new technologies is an essence of modern constructions that work in all variety of mechanical stress conditions.