Electro-chemical Corrosion of a Cast Iron Protected with a Al2O3 Ceramic Layer

Bejinariu, Costică; Munteanu, Corneliu; Florea, Costel; Istrate, Bogdan; Cimpoeşu, Nicanor; Alexandru, Adrian; Sandu, Andrei Victor

doi:10.37358/rc.18.12.6798

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…Some coatings from Figure 12d,f show, especially on the areas represented by the ceramic material, pitting corrosion at the outer part of the particles. This behaviour does not represent the entire surface, being localised only zonally and not being recorded by the potentiostat in the cyclic curves [27]. It can thus be stated that micro-zonally the larger agglomerations on the surface of the coating morphologically manifest a behaviour specific for pitting corro-sion.…”

Section: Electro-corrosion Of Metal-ceramic Systemsmentioning

confidence: 93%

“…The main reason for the corrosion is given by the initial existence of pores and cracks in the coated surfaces. The SEM images shown in Figure 12d,f suggest that the corrosion damage was mainly confined to the coating defects (i.e., pores and cracks) [27,28]. It can be seen that some spherical corrosion products have formed around the coating defects.…”

Section: Electro-corrosion Of Metal-ceramic Systemsmentioning

confidence: 99%

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Microstructural, Corrosion Resistance, and Tribological Properties of Al2O3 Coatings Prepared by Atmospheric Plasma Spraying

et al. 2022

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An usual material, EN-GJL-250 cast iron, used for automotive braking systems, was covered with a ceramic material (105NS-1 aluminium oxide) using an industrial deposition system (Sulzer Metco). The main reason was to improve the corrosion and wear (friction) resistance properties of the cast-iron. Samples were prepared by mechanical grinding and sandblasting before the deposition. We applied two and four passes (around 12–15 µm by layer) each at 90° obtaining ceramic coatings of 30 respectively 60 µm. The surface of the samples (with ceramic coatings) was investigated using scanning electron microscopy (SEM), dispersive energy spectroscopy (EDS) and X-ray diffraction (XRD). Scratch and micro-hardness tests were performed using CETR-UMT-2 micro-tribometer equipment. The better corrosion resistance of the base material was obtained by applying the ceramic coating. The results present a better corrosion resistance and a higher coefficient of friction of the coated samples.

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Section: Electro-corrosion Of Metal-ceramic Systemsmentioning

confidence: 93%

Section: Electro-corrosion Of Metal-ceramic Systemsmentioning

confidence: 99%

Microstructural, Corrosion Resistance, and Tribological Properties of Al2O3 Coatings Prepared by Atmospheric Plasma Spraying

et al. 2022

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“…The substrate surface activation included a series of preparatory operations for the metallization stage, which aimed both to clean the surface from oxides, oils and greases, and to increase its roughness, in order to ensure good adhesion of the coating to the substrate, [32,34]. The surface cleaning operation was performed in two successive phases: chemical cleaning and mechanical cleaning.…”

Section: Technological Workflowmentioning

confidence: 99%

Hard Alloys with High Content of WC and TiC—Deposited by Arc Spraying Process

Toma¹,

Haraga²,

Chicet³

et al. 2021

Welding - Modern Topics

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Obtained by different spraying technologies: in atmospheric plasma spray, High Velocity Oxygen Fuel (HVOF) or laser cladding, the layers of hard alloys with a high content of WC and TiC find their industrial applications due to their high hardness and resistance to wear. Recognized as being a process associated with welding, the arc spraying process is a method applied industrially both in obtaining new surfaces and for reconditioning worn ones. This chapter presents the technology for obtaining ultra-hard layers based on WC and TiC - by the arc spraying process, using a classic spray device equipped with a conical nozzle system and tubular wire additional material containing ultra-hard compounds (WC, TiC). To study both the quality of deposits and the influence of thermal spray process parameters on the properties of deposits with WC and TiC content, we approached various investigative techniques, such as optical scanning microscopy (SEM), X-ray diffraction, and determination of adhesion, porosity, Vickers micro-hardness and wear resistance.

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“…Corrosion of reinforcement or prestressing steel (corrosion loss) is a relatively complicated process that can be observed either under accelerated conditions in a corrosion chamber, in situ on real samples, or through an accelerated laboratory test using electrochemical corrosion [11,12]. Generally, various types of aggressive environments can be found in different locations in the world that affect the final value of the corrosion rate (r corr ).…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Prestressing Level of the Fully Threaded Anchor Bar on the Corrosion Rate

2023

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The article presents experimental research on the corrosion of prestressing steel bars with denotation CKT (fully threaded anchor bars), which are composed of high-quality prestressing steel of the grade Y 1050 (1050 MPa). The experiment was performed using an electrochemical accelerated test. The aspects of the electric current value influence, time dependence on the degree of corrosion, and especially the influence of the prestressing level in the prestressing steel bars on the degree of corrosion were observed and examined. The results of the experiment showed that if the sample was in a stressed state, its degree of corrosion increased. Specifically, for the maximal stress equal to 90% of the tensile strength, the corrosion degree was increased by approximately 7.3%, in comparison to the unstressed specimen. In this case, a 7.3% corrosion degree corresponds to a weight loss of 350 g. The theoretical degree of corrosion was calculated using Faraday’s Law, which allowed the prediction of a rough estimate of the corrosion degree obtained with known input data. The experimental results showed that there was no apparent difference in the corrosion morphology of the sample during the same time-dependent corrosion influence at the same prestressing level in the sample with the same electric current value.

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Electro-chemical Corrosion of a Cast Iron Protected with a Al2O3 Ceramic Layer

Cited by 11 publications

References 15 publications

Microstructural, Corrosion Resistance, and Tribological Properties of Al2O3 Coatings Prepared by Atmospheric Plasma Spraying

Microstructural, Corrosion Resistance, and Tribological Properties of Al2O3 Coatings Prepared by Atmospheric Plasma Spraying

Hard Alloys with High Content of WC and TiC—Deposited by Arc Spraying Process

The Influence of the Prestressing Level of the Fully Threaded Anchor Bar on the Corrosion Rate

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