MDPI - Publisher of Open Access Journals

13 pages, 4847 KiB

Open AccessArticle

Microstructure and Corrosion Resistance of Composite Based on Ultra-High Molecular Weight Polyethylene in Acidic Media

by Mazhyn Skakov, Moldir Bayandinova, Yernat Kozhakhmetov and Bauyrzhan Tuyakbaev

Coatings 2025, 15(1), 89; https://doi.org/10.3390/coatings15010089 - 15 Jan 2025

Cited by 1 | Viewed by 925

In this work, the effect of an acidic environment on the structure of composite samples based on ultra-high molecular weight polyethylene (UHMWPE) modified with mineral filler in the form of diabase (DB) is studied. The stability of samples was investigated in solutions of sulfuric (H₂SO₄) and hydrochloric (HCl) acids with concentrations of 10 vol% and 20 vol% at room temperature for 16 weeks. It was found that the introduction of 10 wt% DB into the UHMWPE matrix significantly increases the resistance of the composite sample to aggressive media, which is confirmed by the minimum degree of swelling compared to pure UHMWPE and composites with higher filler content. Scanning electron microscopy (SEM) demonstrated a uniform distribution of DB in the sample structure and the absence of defects such as agglomeration and cracks. The methods of infrared spectroscopy (IRS) and X-ray structural analysis (XRD) revealed a decrease in the degree of crystallinity of the samples after acid exposure, but no significant changes in the chemical structure of the materials were recorded, which confirms their resistance to chemical degradation. The best chemical resistance was demonstrated by composites containing 10 wt% DB, which is associated with the formation of a barrier structure preventing the diffusion of acids. The obtained results indicate the promising application of UHMWPE with DB filler to create samples resistant to aggressive media. Full article

(This article belongs to the Section Corrosion, Wear and Erosion)

► Show Figures

Figure 1

14 pages, 9094 KiB

Open AccessArticle

Influence of Diabase Filler on the Structure and Tribological Properties of Coatings Based on Ultrahigh Molecular Weight Polyethylene

by Mazhyn Skakov, Moldir Bayandinova, Igor Ocheredko, Baurzhan Tuyakbayev, Makpal Nurizinova and Alexander Gradoboev

Polymers 2023, 15(16), 3465; https://doi.org/10.3390/polym15163465 - 18 Aug 2023

Cited by 9 | Viewed by 1521

Abstract

This article presents the results of a study of a composite coating made of ultrahigh molecular weight polyethylene (UHMWPE) with a diabase filler obtained by flame spraying. Diabase of 10 wt.%, 20 wt.%, 30 wt.% and 40 wt.% was chosen as a filler. The polymer coating was applied to the St3 metal substrate using temperature control in a conventional flame spraying process. The coating was studied using scanning electron microscopy, X-ray phase analysis, infrared spectroscopy, abrasive wear resistance, microhardness testing and determination of the friction coefficient. It has been shown that diabases do not have a negative effect on the initial chemical structure of UHMWPE and it is not subjected to destruction during flame spraying. The introduction of diabase into the composition of UHMWPE with a content of 10–40% of the total mass does not adversely affect the crystalline structure of the coating. It has been established that with an increase in the volume of the diabase filler, the wear resistance of the composite coating based on UHMWPE increases. It has been determined that with the addition of diabase, the microhardness of the coatings increases. Full article

(This article belongs to the Section Polymer Processing and Engineering)

► Show Figures

Figure 1

13 pages, 4499 KiB

Open AccessFeature PaperArticle

Electrically Conductive Silicate Composite for Protection against Electrocorrosion

by Andrii Plugin, Teresa Rucińska, Olga Borziak, Oleksii Pluhin and Vitalii Zhuravel

Minerals 2023, 13(5), 610; https://doi.org/10.3390/min13050610 - 27 Apr 2023

Viewed by 2149

Abstract

This article presents the results of a study on the development of an anti-corrosion plaster composite based on water glass with increased electrical conductivity. Known acid-resistant quartz-fluorosilicate composites containing liquid sodium silicate, sodium fluorosilicate and acid-resistant high-silica filler in the form of quartz, andesite or diabase powder were chosen as the prototype. The low water resistance and low adhesion to Portland cement concrete of these composites limits their application. By adding granulated blast-furnace slag to the composite, it was possible to increase the water resistance of the solution and its adhesion to concrete. The addition of graphite filler to the composite made it possible to increase the electrical conductivity. This made it possible to obtain not only a corrosion-resistant (to chemical and physico-chemical corrosion) composite, but also to use it as a grounded protective screen to drain leakage currents from the structure, thus protecting it from both corrosion and electrocorrosion destruction. Full article

(This article belongs to the Special Issue 65 Years of Alkali Activated Cements and Materials: Achievements and Challenges)

► Show Figures

Figure 1

17 pages, 4288 KiB

Open AccessArticle

High Performance Self-Compacting Concrete with Electric Arc Furnace Slag Aggregate and Cupola Slag Powder

by Israel Sosa, Carlos Thomas, Juan Antonio Polanco, Jesus Setién and Pablo Tamayo

Appl. Sci. 2020, 10(3), 773; https://doi.org/10.3390/app10030773 - 22 Jan 2020

Cited by 56 | Viewed by 4780

Abstract

The development of self-compacting concretes with electric arc furnace slags is a novelty in the field of materials and the production of high-performance concretes with these characteristics is a further achievement. To obtain these high-strength, low-permeability concretes, steel slag aggregates and cupola slag powder are used. To prove the effectiveness of these concretes, they are compared with control concretes that use diabase aggregates, fly ash, and limestone supplementary cementitious materials (SCMs, also called fillers) and intermediate mix proportions. The high density SCMs give the fresh concrete self-compacting thixotropy using high-density aggregates with no segregation. Moreover, the temporal evolution of the mechanical properties of mortars and concretes shows pozzolanic reactions for the cupola slag. The fulfillment of the demands in terms of stability, flowability, and mechanical properties required for this type of concrete, and the savings of natural resources derived from the valorization of waste, make these sustainable concretes a viable option for countless applications in civil engineering. Full article

(This article belongs to the Special Issue High-Performance Eco-Efficient Concrete)

► Show Figures

Figure 1

Search Results (4)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI

Saved Queries

Search Filter Reset All

Years

Feature Papers

Subjects

Journals

Article Types

Countries / Regions

Search Results (4)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI