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. 2020 Apr 29;8:304. doi: 10.3389/fchem.2020.00304

Figure 2.

Figure 2

Optical micrographs of the steel surface after corrosion treatment for 20 h, 6 days, 20 days, and 5 months in simulated concrete pore solutions containing chloride ions. The tests were conducted without inhibitor (REF) and with p-aminobenzoic acid (pAB), succinic acid (SA), and caffeic acid (CA).