| 引用本文: | 肖敏,王胜民,王志斌,邱文利,李海冬,汪成宇.渗锌层硅烷-植酸钝化膜的耐腐蚀性及其成膜机理[J].材料科学与工艺,2024,32(4):11-18.DOI:10.11951/j.issn.1005-0299.20230052. |
| XIAO Min,WANG Shengmin,WANG Zhibin,QIU Wenli,LI Haidong,WANG Chengyu.Corrosion resistance and formation mechanism of silane-phytic acid passivation film on zincizing layer[J].Materials Science and Technology,2024,32(4):11-18.DOI:10.11951/j.issn.1005-0299.20230052. |
|
| |
|
|
| 本文已被：浏览 1810次 下载 1739次 |
码上扫一扫！ |
|
|
| 渗锌层硅烷-植酸钝化膜的耐腐蚀性及其成膜机理 |
|
肖敏1,王胜民1,王志斌2,邱文利2,李海冬2,汪成宇1
|
|
(1. 昆明理工大学 材料科学与工程学院,昆明 650093; 2. 河北雄安京德高速公路有限公司,河北 雄安 071700)
|
|
| 摘要: |
| 为了提高渗锌层耐腐蚀性能,本文对渗锌层进行硅烷-植酸复合钝化并制备了复合钝化膜,通过正交试验优化了复合钝化液各组分的最佳浓度,采用极化曲线(Tafel)、电化学阻抗(EIS)及中性盐雾试验(NSS)研究了复合钝化膜的耐蚀性,利用扫描电镜(SEM)、能谱分析(EDS)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR) 等测试方法分析表征了钝化膜表面形貌及成分,并分析了复合钝化膜的成膜机理。研究表明:硅烷-植酸复合钝化液的最佳组分为:60 mL/L KH550,8 mL/L植酸,3.5 g/L酒石酸,40 mL/L纳米硅酸钾乳液；与渗锌层相比,复合钝化膜的自腐蚀电位从-1.356 V正移到-1.145 V,腐蚀电流密度从 6.843×10-4 A/cm2 降低至5.715×10-5 A/cm2,线性极化电阻增大了7倍；24 h盐雾后,复合钝化试样无白锈产生；复合钝化膜覆盖均匀,表面无裂纹,主要由Zn、Fe、Si、P和N元素组成,膜层中元素主要以 Si-O-Si/Me、P-O-Si/Me、MeO和SiO2 形式存在；在硅烷和植酸的共同作用下,可在渗锌层表面形成一层连续均匀、较致密的钝化膜,提高了基体的耐蚀性。 |
| 关键词: 渗锌层 硅烷 植酸 复合钝化 耐腐蚀性 |
| DOI：10.11951/j.issn.1005-0299.20230052 |
| 分类号:TG174 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(52161013). |
|
| Corrosion resistance and formation mechanism of silane-phytic acid passivation film on zincizing layer |
|
XIAO Min1, WANG Shengmin1, WANG Zhibin2, QIU Wenli2, LI Haidong2, WANG Chengyu1
|
|
(1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2.Hebei Xiongan Jingde Expressway Co., LTD, Xiongan 071700, China)
|
| Abstract: |
| In order to improve the corrosion resistance of the zincizing layer, silane-phytic acid composite passivation was applied to the zincizing layer and a composite passivation film was prepared. The optimal concentrations of each component of the compound passivation solution were determined by orthogonal experiments. The corrosion resistance of the composite passivation film was studied by polarization curves (Tafel), electrochemical impedance spectroscopy (EIS) and neutral salt spray test (NSS). The surface morphology and composition of the passivation film were analyzed by scanning electron microscopy (SEM), energy spectrum analysis (EDS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Additionally, the film formation mechanism of the composite passivation film was analyzed. The results showed that, the optimal composition of the silane-phytic acid complex passivation solution was as follows: 60 mL/L KH550, 8 mL/L phytic acid, 3.5 g/L tartaric acid and 40 mL/L potassium silicate nanosilicate emulsion. Compared with the zincizing layer, the self-corrosion potential of the composite passivation film shifted from -1.356 V to -1.145 V. The corrosion current density decreased from 6.843×10-4 A/cm2 to 5.715×10-5 A/cm2, and the linear polarization resistance increased by 7 times. After 24 hours salt spray, the composite passivation specimens did not produce white rust. The composite passivation film coverd uniformly and had no cracks on the surface, and it was mainly composed of Zn, Fe, Si, P and N elements. The elements in the film layers were mainly present in the form of Si-O-Si/Me, P-O-Si/Me, MeO and SiO2. The combined action of silane and phytic acid forms a continuous, uniform and dense passivation film on the surface of the zincizing layer, which improves the corrosion resistance of the substrate. |
| Key words: zincizing layer silane phytic acid compound passivation corrosion resistance |
|
|
|
|
