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[求助] 帮助看看这有什么语法错误，或者句子通不通顺

In a two-electrode system, the WE and CE impedances are in series and the system impedance is the sum of the WE and CE impedances. Although the impedance of the CE contributes to the system impedance, the change of the system impedance is only related to the WE impedance if the CE impedance does not change with time. To verify the suitability of the CE in the two-electrode system, 200 μg cm-2 NaCl particles were evenly deposited onto the 304SS surfaces. Then the samples were placed in the 75%, 85%, and 97% RH chambers, respectively. After the experiment, the morphologies of the 304SS were analysed using SEM. As shown in Fig. 21, the 304SS surfaces have no sign of corrosion after washing of the NaCl particles in distilled water. Tsutsumi et. al [46] have reported that the pitting corrosion of 304SS progressed only when the concentration of Cl− exceeded 6 mol L-1. A RH of 75% corresponds to a saturated sodium chloride solution (6 mol L-1), 85% RH corresponds to 3.6 mol L-1 NaCl, and 97% RH corresponds to 0.8 mol L-1 NaCl [47]. Accordingly, the 304SS surfaces did not suffer from any corrosion in present study. CE was considered to be undisturbed and its impedance did not change in MS during exposure of 168 h. Meanwhile, the results of weight loss tests (Fig. 19) verified the feasibility of the EIS results in MS. Based on above results, the CE used in MS was reliable.
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