CAJ | 학술논문

目的探究无铬钝化膜的微观形貌和成膜机理。方法通过电化学实验评价钝化膜的耐腐蚀性能；通过扫描电镜观察钝化膜的微观形貌,探究其与耐腐蚀性之间的关系；通过XRD,EDS,XPS分析钝化膜的成分及组成。结果电化学实验表明,镀锌板经钝化处理后,钝化膜抑制锌层的阳极反应,有效降低腐蚀速率。 SEM分析发现,钝化膜表面的平整度与其耐蚀性能无直接关系。 XRD不能用于分析该工艺钝化膜的元素及组成。 EDS和XPS分析结果表明,钝化膜主要含有Zn,C,O,N,Si等元素。结论有机大分子构成钝化膜的主要骨架,SiO2和硅酸盐等吸附于立体骨架结构中,形成一层致密的钝化膜,起到抑制锌层阳极反应的作用。
목적탐구무락둔화막적미관형모화성막궤리。방법통과전화학실험평개둔화막적내부식성능；통과소묘전경관찰둔화막적미관형모,탐구기여내부식성지간적관계；통과XRD,EDS,XPS분석둔화막적성분급조성。결과전화학실험표명,도자판경둔화처리후,둔화막억제자층적양겁반응,유효강저부식속솔。 SEM분석발현,둔화막표면적평정도여기내식성능무직접관계。 XRD불능용우분석해공예둔화막적원소급조성。 EDS화XPS분석결과표명,둔화막주요함유Zn,C,O,N,Si등원소。결론유궤대분자구성둔화막적주요골가,SiO2화규산염등흡부우입체골가결구중,형성일층치밀적둔화막,기도억제자층양겁반응적작용。
ABSTRACT:Objective To study the microstructure and film-forming mechanism of chromium-free passivation film. Methods The corrosion resistance property of passivation film was determined by electrochemical tests. The relationship between the smoothness of the passivation film and the corrosion resistant properties was evaluated by SEM analysis. The element and constitution of passi-vation film were analyzed by XRD, EDS and XPS tests. Results After passivating treatment of the galvanized sheet, the passivation film could restrain the anodic reaction of zinc layer and decrease the corrosion rate. There was no direct relationship between the smoothness of the passivation film and the corrosion resistant properties as shown by SEM analysis. The element and composition of passivation film could not be tested by XRD but could be analyzed by EDS and XPS. The passivation film mainly contained zinc, carbon, oxygen, nitrogen, silicon etc. Conclusions The organic macromolecules formed the main frame in which SiO2 and silicate were absorbed. The unique combination formed a dense passivation film which could restrain the anodic reaction of zinc layer.