Strength loss in E-glass fibres after exposure to organic acids

Accelerated Conversion of Silicate Bioactive Glass (13‐93) to Hydroxyapatite in Aqueous Phosphate Solution Containing Polyanions

“…Originally it was presumed that the corrosion rate was related to the acidic strength of the medium, expressed by the H + concentration 10 . However, later work showed that the anion of the acid can also play a significant role, particularly if the anion can form complex ions or insoluble species with the cations leached out of the glass 11–15 …”

“…Some silicate‐based glasses (such as E‐glass) are susceptible to various degrees of corrosion by aqueous solutions of weak organic acids 13,14 . Although most organic acids have little corrosive effect, oxalic acid and mesoxalic acid (2‐oxopropanedioic acid) are extremely corrosive.…”

The kinetics of corrosion of e-glass fibres in sulphuric acid

“…Such complex formation will effectively remove the leached cations M n+ from the right hand side of the above equation, thus driving the reaction to the right. This complex ion formation has been invoked to explain the severe corrosive effects of relatively weak organic acids such as oxalic acid in which the strength retention versus concentration curves show a well-defined minima [15]. This paper examines the corrosive effects of sulphuric acid at different concentrations and temperatures in an attempt to provide more insights into the kinetics of the process.…”

“…Corrosion can be slowed down considerably by addition of the appropriate metal ions to the acid solution, thus supporting the leaching mechanism [11]. Originally it was presumed that the corrosive effect was related to the acidic strength of the medium expressed as the hydrogen ion concentration, but later work has shown that the associated anion can also play a significant role if the anion can form complex ions or insoluble species with the cations found in the glass [11,[13][14][15][16]. Such complex formation will effectively remove the leached cations M n+ from the right hand side of the above equation, thus driving the reaction to the right.…”

“…The chemical corrosion of E-glass fibres, particularly in acidic environments, is now well established [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. E-glass fibre (electrical grade, high alumino-borosilicate glass) is still the major reinforcing material used in glass reinforced plastic (GRP) composites in Australia, although several reports of GRP failure have been attributed to chemical corrosion [1][2][3][4]12,13,16].…”