1、微弧氧化可以(yi)(yi)一(yi)次(ci)(ci)完成，也可以(yi)(yi)分幾次(ci)(ci)完成。特(te)別對于氧化膜(mo)要求很厚的樣品(pin)可以(yi)(yi)分幾次(ci)(ci)氧化，而陽極氧化一(yi)旦(dan)中(zhong)斷(duan)就(jiu)必須重新(xin)開始(shi)。

2、在(zai)陽(yang)極氧化(hua)(hua)不易(yi)成膜(mo)的某些鋁(lv)合金(jin)(jin)如Al-Cu、Al-Si等合金(jin)(jin)表(biao)面(mian)，同樣可獲得(de)性能很好的厚(hou)膜(mo)，尤其在(zai)Al-Cu合金(jin)(jin)表(biao)面(mian)（如Ly12合金(jin)(jin)），可以(yi)形成高硬(ying)度的厚(hou)膜(mo)，HV可達到1600以(yi)上。微(wei)弧(hu)氧化(hua)(hua)電(dian)源(yuan)、微(wei)弧(hu)氧化(hua)(hua)技術、微(wei)弧(hu)氧化(hua)(hua)設備、微(wei)弧(hu)氧化(hua)(hua)電(dian)源(yuan)

從(cong)微(wei)弧(hu)氧化(hua)(hua)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)技術要求來看，要實(shi)現脈(mo)(mo)沖電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)波(bo)形(xing)(xing)變換(huan)多、參數調節范圍寬，必(bi)定使電(dian)(dian)(dian)(dian)(dian)路(lu)復雜(za)化(hua)(hua)、造(zao)價(jia)提(ti)高、可靠性降低。所以適(shi)用(yong)(yong)(yong)、可靠_且(qie)經濟性的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)結構是(shi)(shi)設計方案的(de)(de)(de)(de)基本出發點。現在國內的(de)(de)(de)(de)大部分(fen)脈(mo)(mo)沖電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)都是(shi)(shi)采用(yong)(yong)(yong)兩(liang)個相(xiang)互(hu)獨立的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)進(jin)行(xing)疊加而組成的(de)(de)(de)(de)，鎂(mei)(mei)合(he)(he)金微(wei)弧(hu)氧化(hua)(hua)技術，在兩(liang)個電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)之間(jian)加上切換(huan)裝置、控制(zhi)正(zheng)負(fu)脈(mo)(mo)沖電(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)截止和導通。但是(shi)(shi)，這(zhe)樣不但使電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)結構復雜(za)化(hua)(hua)，同時也增加了控制(zhi)電(dian)(dian)(dian)(dian)(dian)路(lu)的(de)(de)(de)(de)負(fu)擔，使電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)成本增加。 在考慮(lv)簡化(hua)(hua)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)結構的(de)(de)(de)(de)基礎上，采用(yong)(yong)(yong)復合(he)(he)功率轉換(huan)電(dian)(dian)(dian)(dian)(dian)路(lu)的(de)(de)(de)(de)形(xing)(xing)式，鎂(mei)(mei)合(he)(he)金微(wei)弧(hu)氧化(hua)(hua)，即由前(qian)級向后(hou)級供電(dian)(dian)(dian)(dian)(dian)，由后(hou)級控制(zhi)電(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)設計方案。電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)通過(guo)設定不同的(de)(de)(de)(de)占空比進(jin)行(xing)直流調壓，從(cong)而得到預定的(de)(de)(de)(de)輸出電(dian)(dian)(dian)(dian)(dian)壓，然后(hou)，利用(yong)(yong)(yong)逆(ni)變電(dian)(dian)(dian)(dian)(dian)路(lu)實(shi)現波(bo)形(xing)(xing)控制(zhi)。

微弧氧化現象及特點

在(zai)(zai)陽極氧(yang)(yang)(yang)化(hua)過程中(zhong)，當(dang)鋁合金(jin)上施(shi)加(jia)的(de)(de)電(dian)(dian)壓(ya)(ya)(ya)超過一定范圍時，鎂合金(jin)微(wei)弧(hu)氧(yang)(yang)(yang)化(hua)著(zhu)色，鋁合金(jin)表(biao)面(mian)(mian)的(de)(de)氧(yang)(yang)(yang)化(hua)膜(mo)(mo)就(jiu)會被(bei)擊穿。隨著(zhu)電(dian)(dian)壓(ya)(ya)(ya)的(de)(de)繼(ji)續不斷升(sheng)高，鎂合金(jin)微(wei)弧(hu)氧(yang)(yang)(yang)化(hua)加(jia)工，氧(yang)(yang)(yang)化(hua)膜(mo)(mo)的(de)(de)表(biao)面(mian)(mian)會出(chu)現(xian)輝(hui)光放電(dian)(dian)，微(wei)弧(hu)和火花放電(dian)(dian)燈現(xian)象。在(zai)(zai)微(wei)弧(hu)氧(yang)(yang)(yang)化(hua)的(de)(de)過程下，原來生(sheng)產的(de)(de)氧(yang)(yang)(yang)化(hua)膜(mo)(mo)不會脫(tuo)落，只有表(biao)面(mian)(mian)一部分氧(yang)(yang)(yang)化(hua)膜(mo)(mo)可(ke)能會被(bei)粉化(hua)而沉(chen)淀在(zai)(zai)溶液中(zhong)，脫(tuo)落的(de)(de)表(biao)面(mian)(mian)可(ke)以繼(ji)續氧(yang)(yang)(yang)化(hua)，隨著(zhu)外(wai)加(jia)電(dian)(dian)壓(ya)(ya)(ya)的(de)(de)升(sheng)高，或時間的(de)(de)延長，微(wei)弧(hu)氧(yang)(yang)(yang)化(hua)膜(mo)(mo)厚度會不斷增(zeng)加(jia)，直至達到外(wai)加(jia)電(dian)(dian)壓(ya)(ya)(ya)所(suo)對(dui)應(ying)的(de)(de)終厚度。