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Materials 2018, 11(8), 1381; https://doi.org/10.3390/ma11081381

Corrosion Behavior and Mechanism of Basalt Fibers in Sodium Hydroxide Solution

1
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
2
Joint Center for Intelligent New Energy Vehicle, Shanghai 200092, China
3
College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Received: 12 July 2018 / Revised: 6 August 2018 / Accepted: 7 August 2018 / Published: 8 August 2018
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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. View Full-Text
Keywords: basalt fiber; alkaline corrosion; corrosion behavior; mechanical property basalt fiber; alkaline corrosion; corrosion behavior; mechanical property
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tang, C.; Jiang, H.; Zhang, X.; Li, G.; Cui, J. Corrosion Behavior and Mechanism of Basalt Fibers in Sodium Hydroxide Solution. Materials 2018, 11, 1381.

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