观测钢筋电极在0.4 M NaCl混凝土模拟液中浸泡24 h后的形貌图，从图中可以看出在不添加缓蚀剂时钢筋表面出现了数量较多的腐蚀坑，且尺寸较大。在添加D-葡萄糖酸钠和钼酸钠之后，可以看出明显的差异。点蚀坑的数量有所下降，且尺寸相对较小，说明这两种缓蚀剂对于混凝土模拟溶液中钢筋的腐蚀起到了抑制效果。HRB 400属于低碳热轧钢筋，其截面的组织为典型的珠光体铁素体。从腐蚀形貌图对比可以看出，钢筋电极在三种溶液环境中动电位极化后的腐蚀形貌整体上没有明显的差别，都出现了选择性腐蚀，珠光体组织优先发生腐蚀。但在未添加缓蚀剂的时，钢筋的腐蚀坑较为粗糙，铁素体组织也发生了一定程度的腐蚀，并且存在着许多尺寸很小的孔洞。而当溶液中存在缓蚀剂，尤其是钼酸钠时，腐蚀区域相对较光滑，铁素体组织腐蚀程度较轻，未观察到明显的细小的孔洞。

Observation of the morphology of rebar electrodes after immersion in 0.4 M NaCl concrete simulant for 24 h. From the figure, it can be seen that the surface of the rebar without the addition of corrosion inhibitor shows a higher number of corrosion pits with larger dimensions. After the addition of sodium D-gluconate and sodium molybdate, a significant difference can be seen. The number of pitting pits decreased and the size was relatively small, indicating that the two corrosion inhibitors had an inhibitory effect on the corrosion of the rebar in the concrete simulation solution.HRB 400 belongs to the low carbon hot rolled rebar, and its cross-section is organized as a typical pearlite ferrite. Comparison of the corrosion morphology can be seen from the corrosion morphology diagram, the corrosion morphology of the rebar electrode in the three solution environments after the kinetic potential polarization of the overall corrosion morphology does not have a significant difference between the three solution environments, both appear to be selective corrosion, the pearlitic organization preferentially occurring corrosion. However, when no corrosion inhibitor was added, the corrosion pits of the rebar were rougher, and the ferrite organization was corroded to a certain extent, and there were many holes of small size. And when corrosion inhibitors, especially sodium molybdate, existed in the solution, the corrosion area was relatively smooth, the ferrite organization corroded to a lesser extent, and no obvious tiny holes were observed.