多羟基超分散剂对水性环氧涂层防腐性能的影响

袁世成, 吴艳峰, 徐长慧, 王兴奇, 冷哲, 杨延格

Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings

YUAN Shicheng, WU Yanfeng, XU Changhui, WANG Xingqi, LENG Zhe, YANG Yange

表3 两种涂层浸泡在3.5%NaCl溶液中不同时间的电化学参数

Table 3 Electrochemical parameters of coatings immersed in 3.5%NaCl solution after different time

Coating	Immersion time / h	E_corr / V vs. SCE	I_corr / nA cm^-2	β_a / V·dec^-1	β_c / V·dec^-1	R_p / Ω·cm²
	72	-0.177	0.7	0.162	0.180	5.29×10⁷
EV	384	-0.206	1.1	0.258	0.295	5.43×10⁷
	6720	-0.264	1.2	0.210	0.184	3.55×10⁷
	72	-0.227	1.1	0.169	0.157	3.21×10⁷
EVD	384	-0.247	1.4	0.262	0.213	3.64×10⁷
	6720	-0.400	1.8	0.185	0.214	2.39×10⁷