The effect of bicarbonate additive on corrosion resistance and microstructure characteristics of the zirconium-based conversion coating on carbon steel

被引：2
作者：
Niu, Linqing [1 ]
Guo, Ruiguang [2 ]
Si, Qingmin [1 ]
Guan, Hongyan [1 ]
机构：
[1] Zhengzhou Univ Aeronaut, Zhengzhou 450046, Peoples R China
[2] Xian Univ Architecture & Technol, Key Lab Water Environm & Ecol North China, Minist Educ, Xian 710055, Peoples R China
来源：
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH | 2020年 / 17卷 / 05期
关键词：
Carbon steel; Corrosion; Zirconium-based conversion coating; Bicarbonate; SURFACE CHARACTERIZATION; STAINLESS-STEEL; MILD-STEEL; BEHAVIOR; ZINC; ALUMINUM; FILM; PROTECTION; ADHESION; STRENGTH;
D O I：
10.1007/s11998-020-00349-w
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Zirconium-based conversion coating (ZrCC) with modification has been studied for improving the corrosion resistance of carbon steel in this paper. Ammonium bicarbonate (NH4HCO3) and sodium bicarbonate (NaHCO3) were used as additives to investigate their roles on the conversion coating properties. The surface of the modified coating was characterized by scanning electron microscope, X-ray photoelectron spectroscopy, and electron probe micro-analyzer. In addition, the corrosion resistance was studied by Tafel polarization, electrochemical impedance spectroscopy, and the neutral salt spray test (NSST). The results indicated that both NH(4)HCO(3)and NaHCO(3)as additives could promote the precipitation of ZrO2, ZrF4, K2ZrF6, Fe2O3, and FeOOH on carbon steel and NaHCO(3)as the additive could make the surface thicker and more uniform. According to the electrochemical and NSST results, NH4HCO3- and NaHCO3-modified zirconium-based conversion coating (ZrCC-NH4, ZrCC-Na) exhibited more effective corrosion protection property compared with ZrCC, among which ZrCC-Na sample showed the highest corrosion resistance.
引用
收藏
页码：1309 / 1319
页数：11
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