The corrosion process

Electrochemical noise measurements have been applied to electrochemical systems that show stochastic behavior. The standard area of study that benefits from this stochastic analysis is localized corrosion modes like pitting and crevice corrosion. Application of electrochemical noise measurements to battery systems, though rare, is recently becoming more popular. The present contribution first establishes a method of analyzing electrochemical voltage noise data for NiCd batteries, then follows four samples of batteries in terms of voltage noise throughout their lifetimes.

10p tudichquannguyet 29-11-2021 0 0   Download

A series of 1-(4-(2-allylphenoxy)butyl)piperidin-1-ium halides (4a-d) was synthesized and characterized via spectroscopic methods (FTIR, 1H NMR). The corrosion inhibition of the synthesized halides on carbon steel in water-salt-hydrocarbon environment, saturated with H2S, was investigated. For this purpose, a series of techniques such as gravimetric measurement, potentiodynamic polarisation, and scanning electron microscope (SEM) were used and some thermodynamic parameters of corrosion process (∆Gads., ∆H0 ads., ∆S0ads.) were evaluated.

17p tudichquannguyet 29-11-2021 0 0   Download

This dissertation focuses on establishing the process of manufacturing bimetallic Fe / Cu internal electrolysis nanomaterial, thereby studying some characteristics correlation between corrosive line and TNT decomposition kinetics and time. Setting and optimizing the internal electrolysis process by bimetal Fe / Cu nanomaterials combined with biological method A2O-MBBR (moving bed Biological reactor) to treat TNT wastewater at laboratory scale and Pilot scale at the scene.

27p larachdumlanat129 20-01-2021 9 0   Download

In this study, we used DC mode as a power source of PEO process and investigated the effects of current density on microstructure and properties of coatings on 6061 Al alloy, where the electrolytes containing sodium silicate, sodium tungstate dehydrate and sodium hypophosphite monohydrate are used.

10p cothumenhmong9 04-01-2021 3 0   Download

In addition to breaking down the passive film on embedded steel, the level of chloride content in concrete also influences the electrical resistivity of the concrete and, hence, the kinetics of the reinforcement corrosion, as long as the corrosion process is under resistance control. While there is general agreement in the literature that the binding of chlorides in concrete is higher when CaCl2 is added to the fresh concrete, in comparison with NaCl, the effect of different chloride sources on the concrete resistivity is not so well known.

9p 25262729 31-12-2020 5 0   Download

Functional electrochemical coatings: hydrophobic Ni-TiO2 , catalytic Ni-CeO2 -CuO, and cutting, abrasive Ni-CBN all need to be durable and corrosion resistant to ensure stability in usage process. The presence of chemically inert nano and micron particles in the composite coatings leads to surface texture change and corrosion resistance increase.

16p vivirginia2711 09-12-2020 9 1   Download

The presence of organic sulfur-containing oil in the environment is harmful to animals and human health. The combustion of these compounds in fossil fuels tends to release sulfur dioxide in the atmosphere, which leads to acid rain, corrosion, damage to crops, and an array of other problems. The process of biodesulfurization rationally exploits the ability of certain microorganisms in the removal of sulfur prior to fuel burning, without loss of calorific value.

17p angicungduoc6 20-07-2020 6 0   Download

This study presents the results of applying the method of two-electrode intensive measurements for diagnostic testing of the state of insulating coatings of main pipelines.

6p lucastanguyen 01-06-2020 4 1   Download

This process periodically speeds up the corrosion of the zirconium cladding in the aqueous coolant due to the breakaway of the dense part of oxide scale when its thickness reaches 2 mkm. It is shown that the electronic resistivity of zirconia is not limiting the zirconium oxidation at working temperatures.

5p christabelhuynh 30-05-2020 4 1   Download

The acid corrosion inhibition process of mild steel in 1 M HCl by 4-[(2-amino-1, 3, 4-thiadiazol-5-yl) methoxy]coumarin (ATC), has been investigated using weight loss technique and scanning electron microscopy (SEM).

9p vijiraiya2711 27-05-2020 11 1   Download

The article is devoted to some aspects of research of hostile environment influence on the concrete durability. The mechanism of formation of chaotically diversified difficult structure is described. Chemical interactions of cement with active components of diffusion in steam space are examined.

7p tohitohi 19-05-2020 6 0   Download

Aluminium alloy AlMg4.5Mn has got comprehensive acceptance in the manufacturing of light weight frames, marine structures which require high strength and worthy corrosion revulsion. The present investigation work focuses on friction stir welding process in which influences of operating parameters have been studied on friction stir welded butt joints.

10p tohitohi 19-05-2020 22 0   Download

In summary, it is noted that the corrosion protection of organic coating is enhanced in the presence of silica/polypyrrole composites. However, the mechanisms of corrosion protection are complex and understanding these mechanisms is complicated by many factors that are likely to influence the processes occurring. In previous study, we investigated that the presence of oxalate anion can significantly enhance the corrosion protection performance of PVB coating.

13p abcxyz123_02 18-03-2020 10 0   Download

Blades and vanes for gas turbines, usually made of Ni-based superalloys, are exposed at very high temperature in severe oxidation and corrosion environments. Nowadays, thermal barrier coating systems (TBCs) have been applied to protect them against such severe working conditions. In this study, Pt and PtIr diffusion coatings on Ni based single crystal superalloys were fabricated by an electroplating method followed by an annealing heat treatment process. The microstructure and phase constitution of the coatings were studied by SEM/EDS and XRD methods.

10p chauchaungayxua2 07-01-2020 7 0   Download

Fly ash deposition is an important phenomenon associated with ash/slag handling and discharge in the entrained -flow coal gasification process. Fouling and slagging inside the gasifier may cause reliability and safety problems because they can impose strong negative effects on the gasifier wall in the way of heat transfer and chemical corrosion. For these reasons, this study focuses on investigating the ash deposition distribution inside of a two-stage entrained-flow gasifier.

17p mentospurefresh 29-11-2019 10 1   Download

In the present review, attempts have been made to analyze the metallurgical, mechanical, and corrosion properties of commercial marine alloy duplex stainless steel AISI 2205 with special reference to its weldability, machinability, and surfacing. In the first part, effects of various fusion and solid-state welding processes on joining DSS 2205 with similar and dissimilar metals are addressed.

17p kequaidan1 16-11-2019 10 0   Download

The use of polymeric materials (PMs) and polymeric films (PMFs) has increased in medicine and dentistry. This increasing interest is attributed to not only the excellent surfaces of PMs and PMFs but also their desired mechanical and biological properties, low production cost, and ease in processing, allowing them to be tailored for a wide range of applications. Specifically, PMs and PMFs are used in dentistry for their antimicrobial, drug delivery properties; in preventive, restorative and regenerative therapies; and for corrosion and friction reduction.

10p trinhthamhodang1 14-11-2019 12 0   Download

In this paper we give definition of m-fold completeness and prove a theorem on completeness of elementary generalized solution of corresponding boundary value problems at which the equation describes the process of corrosive fracture of metals in aggressive media and the principal part of the equation has multiple characteristics.

14p danhdanh27 07-01-2019 14 0   Download

Caffeine was isolated from dry green tea leaves and used as corrosion inhibitor. The aim of this paper is to study the corrosion inhibition behavior of caffeine with its different concentrations (from 0.01 g/L to 3.00 g/L) for CT3 steel in 1M HCl solution by the curve polarization measurements and surface examination studies. Experiment result showed that: as the concentration of caffeine increases, the inhibition efficiency increases; %IE max is approximately 83.27% at concentration of caffeine 3.00 g/L.

5p lamtan3547 04-11-2018 19 0   Download

The aim of this study was to evaluate the biomass separation of the small size microalgae Chlorella sp. by electrochemical flotation process with rectangle electrodes using aluminum or iron plates.

6p cumeo2008 30-07-2018 31 0   Download