Corrosion Behavior and Mechanism of Basalt Fibers in Sodium Hydroxide Solution

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.

Two-body abrasive wear behavior of woven basalt fabric reinforced epoxy and polyester composites

“…Among the various natural fibers basalt fiber is gaining popularity recently, owing to its features such as immense strength, good bonding between resin and capability to produce easily. Researchers assured that the beneficial of different forms of basalt fibers in the areas such as resistance to corrosion material in the chemistry industry [3], resistance to abrasive wear and friction material in the transportation sector [4], resistance to impact, strengthening material for construction. Special characteristics of basalt fibers are that they don't have any toxic reaction with air or water.…”

Selection of basalt fiber with resistance to concrete alkaline environment

“…Table 5 displays a fairly significant difference in iron oxide between types A, B and type C: type A-12.6%; type B-11.6%; and type C-16.7%. With regard to chemical composition analysis of degraded basalt fibers, Tang et al [34] studied the alkali resistance of basalt fibers in sodium hydroxide (NaOH) solution, and they noted that the presence of TiO 2 , MnO, Fe 2 O 3 and Al 2 O 3 is slowing alkaline corrosion.…”

Validation of an Image Analysis Method for Evaluating the Chemical Resistance of Glass Fibers to Alkaline Environments

“…The fiber underneath the shell remains intact, and the fiber diameter decreases. The whole cycle is repeated over time [ 4 , 7 , 8 , 9 , 10 , 11 ]. In the second mode, small holes form on the fiber surface, which increases in size to significant holes and cracks.…”

“…However, the long-term chemical resistance of mineral fibers cannot be accurately determined by using one or two methods. The fiber tensile strength test is another method for determining the chemical resistance [ 4 , 8 , 10 , 11 ]. The tensile strength of corroded basalt fibers shows two trends: a general decrease with temperature or exposure time, a cyclical decrease, and an increase depending on the phase of corrosion shell formation [ 4 , 7 , 10 ].…”