鍍鋁--清除鋁膜方法
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- 中子星
- 文章: 1707
- 註冊時間: 週日 02 1月, 2005 20:41
- 來自: hk
鍍鋁--清除鋁膜方法
我想問我應該用乜野去溶主鏡上面d鍍鋁呢??
HCl得唔得??
HCl得唔得??
Re: 鍍鋁
johnsonlee,johnsonlee 寫:我想問我應該用乜野去溶主鏡上面d鍍鋁呢??
HCl得唔得??
HCl & HNO3 & H2SO3 (鹽酸和硝酸和硫酸)也不能徹底清除鋁膜 (Aluminium coating).
鋁是 Alkaline metal,要用 Base / alkali (碱)合成 ,例如sodium hydroxide (氫氧化鈉),
變成易溶於水的Aluminium hydroxide(氫氧化鋁).
在五金店或賣廁所清潔劑地方(超級市場)購買用小膠樽盛載"哥士的"(洗廁所用),一片片白色的"哥士的"就是氫氧化鈉.
先用膠盆放上足夠淹蓋玻璃厚度水份,才倒下哥士的片,大約5~10%,
5吋(120mm)鏡約1/3~1/2樽.濃度不足是不能溶掉鋁膜,待全部溶解才放玻璃.
小心,哥士的是高度腐蝕性液體,切勿用手觸摸,記著需要的話必需帶膠手套.
理想情況是在十分鏡內溶解鋁膜.濃度不足時,加哥士的片在玻璃邊再慢慢搖動膠盆,
切勿直接倒哥士的片在玻璃上,哥士的是侵蝕玻璃的!
不要把玻璃浸在哥士的溶液超過30分鐘,太長時間的話它會把玻璃表面蝕成一個個小孔.
請小心!
Wongsir
最後由 Wongsir 於 週一 23 4月, 2007 23:13 編輯,總共編輯了 4 次。
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear Mr. Hope,hope 寫:可是,請教Wongsir,在鋁膜上又加了石英,又要如何處理呢?廠家好像都不願處理加上保護膜的反射鏡的再生.
Regret to say that there is no simple way to remove the silcion monoxide overcoating.
The only way that amateur could do is to polish away the coating by pitch lap. However there is a danger - the figure of the mirror might change upon pitch polsihing.
Best regards
Chan Yuk Lun
Re: 鍍鋁--清除鋁膜方法
Dear Johnsonlee,johnsonlee 寫:我想問我應該用乜野去溶主鏡上面d鍍鋁呢??
HCl得唔得??
如果鏡面只有鍍鋁的話,我試過用 "省" 銅水去洗係可以將鍍鋁去掉的!
先去五金鋪買支"省" 銅水, BRASSXXX 牌子的,摇勻後用棉花沾多D再好輕、好輕力咁將省銅水塗到鏡面上,小心千祈唔好用力"卒",唔係會整花鏡面。好快你會見到鏡面的鍍鋁發黑,之後用乾淨o既棉花將鏡面的"省" 銅水去掉,再用洗潔精洗一下鏡面就OK。
十幾年前我用呢個方法試過去洗過兩塊純鍍鋁o既鏡,兩塊都成功去掉鍍鋁層。但係而家o既鍍鋁鏡面是否可以呢個方法就要你去試下啦,另外鋁面上加鍍了保護層是否可以用呢個法亦係要試過至知! 不過"省" 銅水好平一支,大可一試。
Hay
Subaru,Subaru 寫:如果你地果d鏡係攞上智通鍍, 就不能用一般solvent去溶咗d鋁膜, 因為智通係有鍍SiO保護膜. 其實有SiO保護膜, 塊鏡起碼可以用十年都唔洗返鍍.
假如無SiO保護膜, 可以用濃硝酸或濃琉酸洗, 不過呢d chemical好似要有牌照先買到, 而且很危險.
Yes, concentrated HNO3 can also dissolve the Al coating.
Apply conc HNO3 directly on the mirror surface.
For safety sake, we can used acid rather than sodium hydroxide.
Using HNO3 to remove silver is extremely good.
Wongsir
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear ATMers,
Experience told that when a coating gets old, the aluminuim layer will be seriously oxidized.
Unfortunately aluminium oxide is very hard and very durable. It cannot be dissolved by conc. Nitric, Sulphuric, Hydrocjoric acid nor by Strong alkaline.
The only way to remove aluminium oxide is to polish it away by pitch lap. Luckily the thickness of natural formed aluminium oxide is much smaller than the silicon monoxide overcoat and so very gentle polishing is required to remove the aluminium oxide layer. The figure of themirror is generally not affected.
How do I konw all about this ? Because I am also a mirror maker and has gone through all the pitfalls.
Best regards
Chan Yuk Lun
Experience told that when a coating gets old, the aluminuim layer will be seriously oxidized.
Unfortunately aluminium oxide is very hard and very durable. It cannot be dissolved by conc. Nitric, Sulphuric, Hydrocjoric acid nor by Strong alkaline.
The only way to remove aluminium oxide is to polish it away by pitch lap. Luckily the thickness of natural formed aluminium oxide is much smaller than the silicon monoxide overcoat and so very gentle polishing is required to remove the aluminium oxide layer. The figure of themirror is generally not affected.
How do I konw all about this ? Because I am also a mirror maker and has gone through all the pitfalls.
Best regards
Chan Yuk Lun
-
- 中子星
- 文章: 1707
- 註冊時間: 週日 02 1月, 2005 20:41
- 來自: hk
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