CAJ | 학술논문

在硅酸盐、磷酸盐、焦磷酸盐或其混合电解液中对锆-4合金进行等离子电解氧化.通过实验确定合适的工艺参数,并运用电化学技术、显微硬度、SEM、XRD等技术对膜层性能进行表征.结果表明:在纯的硅酸盐电解液中得到的膜层很不均匀,且在添加磷酸盐后,膜层均匀性仍然很差.在焦磷酸盐体系中得到的膜层比较均匀,但硬度低.在焦磷酸盐体系中添加硅酸盐后,膜层的均匀性和硬度都得到改善.XRD结果表明,膜层的主要成分为单斜氧化锆和四方氧化锆.添加硅酸盐后,有利于四方氧化锆的形成.极化曲线结果表明,在焦磷酸盐以及焦磷酸盐与硅酸盐混合体系中得到的膜层具有较强的耐蚀性.
재규산염、린산염、초린산염혹기혼합전해액중대고-4합금진행등리자전해양화.통과실험학정합괄적공예삼수,병운용전화학기술、현미경도、SEM、XRD등기술대막층성능진행표정.결과표명:재순적규산염전해액중득도적막층흔불균균,차재첨가린산염후,막층균균성잉연흔차.재초린산염체계중득도적막층비교균균,단경도저.재초린산염체계중첨가규산염후,막층적균균성화경도도득도개선.XRD결과표명,막층적주요성분위단사양화고화사방양화고.첨가규산염후,유리우사방양화고적형성.겁화곡선결과표명,재초린산염이급초린산염여규산염혼합체계중득도적막층구유교강적내식성.
The plasma electrolytic oxidation (PEO) coatings on zircaloy-4 alloy were prepared in silicate,phosphate and pyrophosphate electrolyte systems or their combination by DC current regime.The proper processing parameters were determined and the coatings were evaluated by electrochemistry technique,micro-hardness,SEM and XRD.The results show that the coating prepared in pure silicate system is uneven and after the addition of phosphate solution,the homogeneity of the coating is still poor.The coating prepared in pure pyrophosphate electrolyte system is homogeneous,but its hardness value is low.After the addition of silicate into the pyrophosphate electrolytic system,both the uniformity and hardness of the coating are improved.The XRD results show that the phase compositions are m-ZrO2 and t-ZrO2,the addition of silicate is beneficial to the formation of t-ZrO2.The results of polarization curves show that the coatings prepared in pyrophosphate and the mixture of pyrophosphate and silicate have better corrosion resistance.