The Corrosion Resistance and Mechanism of AT13/Fe-Based Amorphous Composite Coatings

Due to high strength, high wear resistance and high corrosion resistance, the amorphous metallic glasses were investigated widely. In the present study, the corrosion resistance of amorphous coating and composite coatings with various proportions of AT13 (Al2O3–13 wt.% TiO2) ceramic as additions in 3.5 wt.% NaCl solution were studied. The corrosion resistance was improved obviously as the addition of AT13, and when the content of AT13 was 15 wt.%, the composite coating had the lowest corrosion current density (1.75 × 10−6 A cm−2) and the highest corrosion potential (−411 mV), which was 5.14 × 10−5 A cm−2 and −580 mV for Fe-based metallic glassy coating, respectively. The corrosion mechanism was proposed according to the long-time immersion corrosion test.

The Corrosion Resistance and Mechanism of AT13/Fe-based Amorphous Composite Coatings

In the present study, the corrosion resistance of amorphous coating and composite coatings in 3.5 wt.% NaCl, 0.5 M H2SO4 and 10 wt.% NaOH solution were studied. The composite coatings exhibit superior corrosion resistance. When the content of AT13 （Al2O3–13 wt.% TiO2）was 15 wt.%, the composite coating has the lowest corrosion current density (1.75×10-6 A cm-2), which is 5.14×10-5 A cm-2 for Fe-based metallic glassy coating, and the highest corrosion potential (-411 mV), which is -580 mV for Fe-based metallic glassy coating. The breakdown potential of the passivation film in 3.5 wt.% NaCl solution was much higher than that of 316L.The long-time immersion corrosion tests carried out on different coatings showed that the corrosion protection effect of coating was enhanced with the increase of the amount of AT13 added.

Analysis of methods for increasing the oxidation resistance of carbon-graphite products used in metallurgical and chemical units

This review study analyses the existing methods for increasing the oxidation resistance of carbon-graphite products, as well as assesses their applicability in metallurgical and chemical units. The reseach basis was the data published on the oxidation mechanism of carbon-graphite materials, conditions for their use in metallurgical and chemical processes, as well as existing technologies aimed at improving the oxidation resistance of artificial graphites. The existing ideas about the kinetics of carbon graphite oxidation are described depending on temperature conditions. A review of existing technologies for increasing the oxidation resistance of materials and their economic efficiency, taking into account the conditions of their operation, was carried out. Prospects of the presented solutions for the units of metallurgical and chemical industries were analysed. Three modes of oxidation of graphitised materials were distinguished on the basis of operating conditions, chemical and physical properties. According to this classification, the most rational method for increasing oxidation resistance consists in the impregnation of carbon-graphite materials with the formation of a protective glassy coating in the volume of through pores or with the formation of a coating (a continuous layer on the surface of the product) due to the occurrence of a chemical reaction with the reagents used. For most metallurgical and chemical units, the impregnation of carbon-graphite materials with the formation of borate and phosphate glasses is preferable, primarily due to lower economic costs. The applicability of this method is currently limited by temperature conditions, at which the protective properties and continuity of the formed glassy coatings are preserved. Therefore, additional research is required to adapt the conventional technological and technical solutions to the high-temperature conditions of metallurgical units (over 800°C).

Non-elastic glassy coating with fouling release and resistance abilities

A novel hard coating with a non-leaching, self-enriched amphiphilic telomer has been developed, which exhibits excellent robustness, fouling release and fouling resistance.

RESEARCH OF THE POSSIBILITY OF GETTING UNFRITTED GLAZES IN THE SYSTEMS “GLASS NG-3 - ULEXITE” AND “GLASS NG-3 - COLEMANITE”

The article presents the results of a priori estimation and experimental confirmation of the possibility of obtaining unfritted low-baked glazes for majolica based on low-alkali glass NS-3 and poorly soluble complex boron-containing materials - ulexite and colemanite. The main conditions are formulated that determine the algorithm for modeling the composition of unfritted glazes, ranked by their specific influence on the final physicochemical properties of the glaze coating formed during firing: reduced compared to the shard, low melting point and high glass transition speed, compatibility of the thermal coefficients of linear expansion of the glassy coating and shard , high chemical stability of the formed glassy coating in relation to various reagents, application as yrevyh materials poorly soluble substances. The studies are carried out in two-component systems "NG-3 glass - ulexite" and "NG-3 glass - colemanite", in which the role of the matrix is played by low-alkali chemically stable glass NG-3, and ulexite and colemanite - modifiers of its composition, which contribute to lowering the transition temperature in a plastic state in which glazing of the surface of a ceramic crock is possible. The results of experimental studies confirms the possibility of obtaining glazes in the considered two-component systems. The possibility of obtaining transparent coating glazes in the NG-3 - ulexite glass system and opaque "muffled" glazes in the NG-3 - colemanite glass system is established.

Nanocrystallization in magnetron sputtered Zr–Cu–Al–Ag thin film metallic glasses

Zr-based thin film metallic glasses (TFMG) were fabricated from a polycrystalline Zr48Cu36Al8Ag8 (at.%) target by DC magnetron sputtering. A series of characterization techniques were employed to study the structure, composition and thermal stability of the glassy coating. Annealing studies show nanocrystallites of CuZr2 in an amorphous matrix.