CAJ | 학술논문

通过磷化/硅酸盐溶胶封闭后处理技术，在镀锌钢表面生成完整的复合膜。采用 X 射线光电子能谱研究复合膜的化学组成。将复合膜用刀片划伤至露出锌层，经中性盐雾(NSS)腐蚀若干时间后，采用 SEM 和 EDS 研究划痕表面腐蚀产物的显微组织和化学成分，并与未划伤的腐蚀试样进行对比。探讨复合膜的自愈机理。结果表明，在腐蚀过程中，复合膜溶解出的自愈性离子扩散迁移至划痕表面或缺陷处，与Zn2+重新结合生成不溶性化合物，覆盖划痕或缺陷表面。腐蚀产物中含有Si、P、O、Cl和Zn五种元素，为致密细小的针片状，能较好阻滞裸露锌层腐蚀的形成和扩展。复合膜具有良好的自愈性能。
통과린화/규산염용효봉폐후처리기술，재도자강표면생성완정적복합막。채용 X 사선광전자능보연구복합막적화학조성。장복합막용도편화상지로출자층，경중성염무(NSS)부식약간시간후，채용 SEM 화 EDS 연구화흔표면부식산물적현미조직화화학성분，병여미화상적부식시양진행대비。탐토복합막적자유궤리。결과표명，재부식과정중，복합막용해출적자유성리자확산천이지화흔표면혹결함처，여Zn2+중신결합생성불용성화합물，복개화흔혹결함표면。부식산물중함유Si、P、O、Cl화Zn오충원소，위치밀세소적침편상，능교호조체라로자층부식적형성화확전。복합막구유량호적자유성능。
Silicate sol post-treatment was applied to form a complete composite coating on the phosphated zinc layer. The chemical compositions of the coatings were investigated using XPS. The coated samples were firstly scratched and then exposed to the neutral salt spray (NSS) chamber for different time. The microstructure and chemical compositions of the scratches were studied using SEM and EDS. And the non-scratched coated samples were compared. The self-healing mechanism of the composite coatings was discussed. The results show that during corrosion, the self-healing ions in composite coatings dissolve, diffuse and transfer to the scratches or the defects, and then recombine with Zn2+to form insoluble compound, which deposits and covers the exposed zinc. The corrosion products on the scratches contain silicon, phosphorous, oxygen, chloride and zinc, and they are compact, fine, needle and flake, effectively inhibiting the corrosion formation and expansion of the exposed zinc layer. The composite coatings have good self-healing ability.