自製電路板 (PCB) 蝕刻液, 氫氯酸 + 過氧化氫 (鹽酸 + 雙氧水)


review :環保蝕PCB法: (偽)Midorio蝕刻液!! (30/7更新)

review : http://www.stephenhobley.com/blog/2011/03/02/still-messing-with-forces-i-dont-understand-the-formula/?utm_source=Arkayne_network&utm_medium=Arkayne_Plugin

original content
http://www.opencircuits.com/Chemical_Etchants#vinegar_and_salt

翻譯 –

自製電路板 (PCB) 蝕刻液, 氫氯酸 + 過氧化氫 (鹽酸 + 雙氧水)

混合約 1份 [鹽酸] 以及2份 [過氧化氫], 就可以自製一種強力的PCB蝕刻液.
稀釋鹽酸常用作通渠水, 五金商店有賣,也被稱為鏹水.

過氧化氫, 別名[雙氧水], 通常用於清洗傷口.
安全事項,戴橡膠手套, 保持通風, 不要吸入煙霧.

常溫時, 蝕刻 3“X5 的PCB大約需時不到10分鐘.

當蝕刻完畢,蝕刻液看起來是綠色, 因為溶液內有PCB的腐蝕溶解的銅

這蝕刻液具有強腐蝕性,並會燒傷皮膚,這就是為什麼你應該戴上手套。
棄置處理
蝕刻液容易使用, 也不難廢棄處理。加入小蘇打 (鹼) 就可以中和這種酸性腐蝕劑, 方便棄置。把小蘇打慢慢倒入, 避免沸騰或溢出 (白醋+小蘇打也會發生的類似的化學反應), 直到凝固,然後讓它在陽光下晒乾。化學廢料處理可能幫助你如何處理, 但是不要直接倒入排水管, 因為會腐蝕金屬的管路, 特別是廁所的排水管.

如果棄置處理嫌麻煩, 可以不斷重複使用這種蝕刻液. 事實上,使用這種蝕刻液, 經過幾次蝕刻後,溶液已經成為 [酸性氯化銅](見下文)。

HydroChloric Acid / Hydrogen Peroxide

Mixing about 1 part HCl (Which can be found at most hardware stores, also known as Muriatic Acid. Ask for concrete cleaner.) into 2 parts Hydrogen peroxide (normally used for cleaning cuts) you can make a fairly powerful etchant. Use gloves and don’t breathe the fumes though. This will etch a 3″x5″ board in less than 10 minutes. No need to heat it up. I usually like to drill a small hole through the board on a corner and thread a wire or nylon string through to help agitate / remove the board.

When the board is done etching, the etchant will probably look like green kool-aid, from the copper content in it. This stuff is highly corrosive and will burn skin, which is why you should wear gloves. But it is easy to handle, and fairly easy to dispose of. the etchant is easily deactivated with baking soda. Pour enough baking soda into it slowly (to keep it from boiling and overflowing… remember what happens with baking soda/vinegar? ya…) until it is a solid mass, then leave it in the sun to dry. You should contact your local authorities to find out what you should do with it next. Whatever you do, DO NOT dump the stuff down the drain, it will eat through your pipes just like any of the other etchants.

Alternatively, instead of disposing of the etchant, you can re-use it again and again. In fact, after etching a few boards with this solution, you will have successfully made Acid Cupric Chloride (see below).

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