哈尔滨工程大学学报
哈爾濱工程大學學報
합이빈공정대학학보
JOURNAL OF HARBIN ENGINEERING UNIVERSITY
2014年
4期
510-515
,共6页
刘兴华%朱立群%刘慧丛%李卫平
劉興華%硃立群%劉慧叢%李衛平
류흥화%주립군%류혜총%리위평
微弧氧化%放电火花%表面粗糙度%台阶升压%放电通道%表面形貌%铝合金膜
微弧氧化%放電火花%錶麵粗糙度%檯階升壓%放電通道%錶麵形貌%鋁閤金膜
미호양화%방전화화%표면조조도%태계승압%방전통도%표면형모%려합금막
micro-arc oxidation%discharge sparks%surface roughness%step-by-step increase voltage%discharge pas-sage%surface shape%aluminum alloy coating
为了探究铝合金微弧氧化膜层生长过程中的表面粗糙度变化,研究了氧化过程中放电火花随电压升高而表现出的阶段性特点,并分析其对微弧氧化膜层表面粗糙度的影响。将反应过程分为4个阶段,对氧化膜层形貌、厚度、表面粗糙度及膜层元素成分进行了分析,结合各阶段的火花状态讨论了表面粗糙度变化的可能原因。结果表明:在无火花阶段膜层粗糙度受基体表面粗糙度影响较大;白色小火花阶段形成细密的微弧氧化膜层,表面粗糙度逐渐降低;而后进入黄色小火花阶段,膜层生长速率增加,氧化物堆积膜层表面形成火山状突起,表面粗糙度变化出现拐点;当氧化进入橘黄色大火花放电阶段,火山状凸起更多,膜层表面粗糙度迅速增加。
為瞭探究鋁閤金微弧氧化膜層生長過程中的錶麵粗糙度變化,研究瞭氧化過程中放電火花隨電壓升高而錶現齣的階段性特點,併分析其對微弧氧化膜層錶麵粗糙度的影響。將反應過程分為4箇階段,對氧化膜層形貌、厚度、錶麵粗糙度及膜層元素成分進行瞭分析,結閤各階段的火花狀態討論瞭錶麵粗糙度變化的可能原因。結果錶明:在無火花階段膜層粗糙度受基體錶麵粗糙度影響較大;白色小火花階段形成細密的微弧氧化膜層,錶麵粗糙度逐漸降低;而後進入黃色小火花階段,膜層生長速率增加,氧化物堆積膜層錶麵形成火山狀突起,錶麵粗糙度變化齣現枴點;噹氧化進入橘黃色大火花放電階段,火山狀凸起更多,膜層錶麵粗糙度迅速增加。
위료탐구려합금미호양화막층생장과정중적표면조조도변화,연구료양화과정중방전화화수전압승고이표현출적계단성특점,병분석기대미호양화막층표면조조도적영향。장반응과정분위4개계단,대양화막층형모、후도、표면조조도급막층원소성분진행료분석,결합각계단적화화상태토론료표면조조도변화적가능원인。결과표명:재무화화계단막층조조도수기체표면조조도영향교대;백색소화화계단형성세밀적미호양화막층,표면조조도축점강저;이후진입황색소화화계단,막층생장속솔증가,양화물퇴적막층표면형성화산상돌기,표면조조도변화출현괴점;당양화진입귤황색대화화방전계단,화산상철기경다,막층표면조조도신속증가。
In order to research the changes of the surface roughness of aluminum alloy micro-arc oxidation ( MAO) coating during the reaction process, different stages of the discharge sparks were investigated when the voltage in-creased during the oxidization process and the influences of the sparks on the surface roughness of the coating were also studied. The reaction process was divided into four stages;the shape, thickness, surface roughness and the el-emental composition of the coating formed in these stages were analyzed. The reasons why the surface roughness of the coating changed were discussed on the basis of the spark status at each stage. The results are shown as follows:in the stage without the spark, the surface roughness of the coating was influenced greatly by the matrix; in the stage with the white small spark, a compact oxide coating formed and the surface roughness decreased gradually;in the stage with the yellow small spark, the growth rate of the coating increased and oxide gathered on the coating surface and formed a volcano-like bulge. For this reason,the surface roughness began to increase. When the MAO reaction moved into the orange big spark stage, more volcano-like bulges appeared. In addition, the surface rough-ness of the coating increased quickly.