Black steel starts rusting even before it is used. On the other hand, no corrosion effect has been detected on GFRP fiberglass rebar. https://www.tuf-bar.com/application/gfrp-vs-steel/gfrp-vs-black-steel/
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steel rebar

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Black steel starts rusting even before it is used. On the other hand, no corrosion effect has been detected on GFRP fiberglass rebar. https://www.tuf-bar.com/application/gfrp-vs-steel/gfrp-vs-black-steel/