scholarly journals An XPS study of HCN-derived films on pyrite surfaces: a prebiotic chemistry standpoint towards the development of protective coatings

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20109-20117
Author(s):  
Cristina Pérez-Fernández ◽  
Marta Ruiz-Bermejo ◽  
Santos Gálvez-Martínez ◽  
Eva Mateo-Martí
Keyword(s):  
Prebiotic Chemistry ◽  
Protective Coatings ◽  
Pyrite Surface ◽  
Corrosion Properties ◽  
Hydrothermal Environment ◽  
Xps Study

Alkaline hydrothermal environment led to a NH4CN-based film with protective corrosion properties on the highly reactive pyrite surface.

scholarly journals Thermodynamic Jump from Prebiotic Microsystems to Primary Living Cells

Sci ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 58
Keyword(s):  
Free Energy ◽  
Organic Substance ◽  
Prebiotic Chemistry ◽  
Living Cells ◽  
Computational Experiments ◽  
Chemical Parameters ◽  
Schematic Representation ◽  
Hydrothermal Environment ◽  
Continuous Chemical

It is proposed that the primary living cells (“probionts”) cannot emerge of organic substance simply by continuous chemical complication of prebiotic macromolecules and microsystems. The complication must be accompanied by the radical thermodynamic transformation (“jump”) of prebiotic microsystems that resulted in the acquired ability to extract free energy from the environment and export entropy. This transformation is called “the thermodynamic inversion” The inversion may occur by means of the efficient (intensified) response of the microsystems on the oscillations of physic-chemical parameters in hydrothermal environment. In this case the surplus available free energy within a microsystem, when combined with the informational modality, facilitates its conversion into a new microsystem—a living probiont. It is shown the schematic representation of an oscillating prebiotic microsystem that is transforming into a living probiont. A new kind of laboratory and computational experiments on prebiotic chemistry under oscillating conditions is offered to verify the inversion concept.

scholarly journals Thermodynamic Jump from Prebiotic Microsystems to Primary Living Cells

Sci ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 14
Author(s):  
Vladimir Kompanichenko
Keyword(s):  
Free Energy ◽  
Organic Substance ◽  
Prebiotic Chemistry ◽  
Living Cells ◽  
Computational Experiments ◽  
Chemical Parameters ◽  
Schematic Representation ◽  
Hydrothermal Environment ◽  
Continuous Chemical

It is proposed that the primary living cells (“probionts”) cannot emerge of organic substance simply by continuous chemical complication of prebiotic macromolecules and microsystems. The complication must be accompanied by the radical thermodynamic transformation (“jump”) of prebiotic microsystems that resulted in the acquired ability to extract free energy from the environment and export entropy. This transformation is called “the thermodynamic inversion” The inversion may occur by means of the efficient (intensified) response of the microsystems on the oscillations of physic-chemical parameters in hydrothermal environment. In this case the surplus available free energy within a microsystem, when combined with the informational modality, facilitates its conversion into a new microsystem—a living probiont. It is shown the schematic representation of an oscillating prebiotic microsystem that is transforming into a living probiont. A new kind of laboratory and computational experiments on prebiotic chemistry under oscillating conditions is offered to verify the inversion concept.

Determination of Mechanical and Corrosion Properties of Boride Coating on P91 Steel

2010 ◽  
Vol 438 ◽  
pp. 89-96
Author(s):  
Haidar Omar ◽  
Nikolaos Michailidis ◽  
Stefanos Skolianos ◽  
Azarias Mavropoulos ◽  
Sofia Tsipas ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Protective Coatings ◽  
Salt Spray ◽  
Fatigue Properties ◽  
Boride Coating ◽  
Corrosion Properties ◽  
P91 Steel ◽  
The One ◽  
Corrosive Environments

In many applications, even high-performance alloys have to be covered with protective coatings, providing higher corrosion and oxidation resistance, as compared to the alloy itself. This study investigates the feasibility to apply boron coatings on P91 steel by pack cementation process, to increase the steel durability in oxidative and corrosive environments, as well as its mechanical strength. Micro-indentation and the coating impact test were used to characterize the hardness and fatigue properties of the film respectively. The coating corrosion resistance versus the one of the uncoated P91 steel was tested in a salt spray chamber. The coating performance was characterized by optical and scanning electron microscopy to check the consistency of the coated and uncoated surfaces and the oxidation extend. The results show an increased film strength, good fatigue performance and adequate corrosion resistance.

scholarly journals Corrosion Properties Of 1.4512 Ferritic And 1.4404 Austenitic Steels For The Automotive Industry

2019 ◽  
Vol 1 (1) ◽  
pp. 745-752
Author(s):  
Viera Zatkalíková ◽  
Lenka Markovičová ◽  
Anna Wróbel-Knysak
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Protective Coatings ◽  
Exhaust System ◽  
Austenitic Steels ◽  
Road Maintenance ◽  
Corrosion Properties ◽  
Pitting Corrosion Resistance ◽  
Winter Road ◽  
The Common

AbstractExhaust systems are susceptible to in-service wear because of their exposition to the very aggressive corrosive environment. Various stainless steels grades (mostly ferritic and austenitic, but also martensitic and duplex) and protective coatings are currently used for exhaust system elements to increase their aestetics and corrosion resistance. This article focuses on evaluation and comparison of the common corrosion properties of two stainless steels with different microstructures (ferritic and austenitic) used for exhaust system components at the low ambient temperature (35 °C). An aggressive acidic corrosion solution for electrochemical cyclic potentiodynamic tests (ASTM G61) was chosen to simulate partly inner (condensate) and also external environment (reaction of exhaust gases with water, chlorides in solution after winter road maintenance). Exposure tests of the pitting corrosion resistance were performed according to ASTM G48 standard method.

scholarly journals STRUCTURE AND PROPERTIES OF COATINGS BASED ON FeCrAl AND Cr18Ni10T

2020 ◽  
pp. 125-131
Author(s):  
V.А. Belous ◽  
М.A. Bortnitskaya ◽  
R.L. Vasilenko ◽  
V.N. Voyevodin ◽  
І.О. Klimenko ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Protective Coatings ◽  
Vacuum Arc ◽  
Properties Of Coatings ◽  
Corrosion Properties ◽  
Composition Optimization ◽  
Vacuum Arc Deposition ◽  
Mechanical And Corrosion Properties ◽  
Reaction Atmosphere ◽  
Mechanical Properties And Corrosion

The process of vacuum-arc deposition of protective coatings from multicomponent FeCrAl cathodes and 18Cr10NiT stainless steel onto fragments of Zr1Nb alloy claddings has been developed. The influence of the reaction atmosphere (vacuum, nitrogen, oxygen) during the deposition of coatings on their structure, mechanical and corrosion properties is investigated. Coatings deposited in vacuum from the Cr18Ni10T cathode have the best set of mechanical properties and corrosion resistance; whereas coatings based on FeCrAl require composition optimization. It has been established that coatings deposited from FeCrAl and stainless steel cathodes with a thickness of 20 μm significantly increase oxidation resistance and prevent the destruction of fuel cladding under exposure to air at 1150 °C for 1 h.

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