Abstract
In this paper, the corrosion mechanism and tensile properties of basalt fibers in sodium hydroxide (NaOH) solution with various concentrations and temperatures were studied. The hydroxyl ions disrupt the –Si–O–Si– and –Si–O–Al– bonds leading to the formation of insoluble hydroxides. With the continuation of the hydration reaction, a hydration layer (corrosion shell) with high content of calcium, iron, manganese and titanium ions was formed on the fiber surface. The corrosion shell enabled an increase in the strength and elongation at break of basalt fibers, significantly. Results showed that the tensile strength of fibers was strongly dependent on temperature and concentration. After the basalt fibers were immersed in 1 mol/L NaOH solution at 50 °C for 1 h, 3 h, 6 h, 1 day and 3 days, their retention ratios of strength were 67.6%, 57.8%, 52.5%, 49.0%, 58.2%, respectively. Higher temperature accelerated the corrosion rate of basalt fibers, shortened the formation time of the corrosion shell and increased mass loss. From 25 to 70 °C, the mass loss of fibers increased from 2.4% to 33.8% for fibers immersed in 1 mol/L NaOH for 3 days. The experimental results from quantitative x-ray fluorescence (XRF) showed that the mass loss of basalt fibers was mainly due to the leaching of silicon, aluminum and potassium ions.
Highlights
Composite materials reinforced with fibers have been widely used in machinery, automobile, and other industries [1,2,3,4]
The results showed that tensile strength respectively decreased to 33.8%, 18.0%, 10.2% and 5.8% at a temperature of 25 ◦ C after ageing for 7, 18, 34 and 66 days
In order to remove the sizing emulsifier used in the spinning process, basalt fibers were first soaked in acetone for a long
Summary
Composite materials reinforced with fibers have been widely used in machinery, automobile, and other industries [1,2,3,4]. The application temperature range of basalt fibers is –200 to +700 ◦ C. The application temperature range of glass fiber is only −60 to +450 ◦ C [6]. Basalt fibers have similar or better mechanical property—improved thermal and chemical stability—than that of E-glass fibers [7,8,9]. Due to advantages such as higher application temperature, harmlessness to human beings and excellent resistance to alkaline and acid attack, basalt fibers are increasingly being used to replace glass fiber as a reinforcement material in polymer, concrete and metallic matrices [5,10,11,12]. Understanding the chemical resistance of basalt fibers in an alkaline environment is significantly important
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
