Photochemical Machining of Molybdenum

Etchants for Chemical Machining of Aluminium and Its Alloys

“…It can be used alone or can be added to main etchant for extending chemical machining period. This etchant, as is reported, ensures the highest chemical machining performances [6][7][8]. It is noted that machining performance is better even when low temperatures are used 3HCl + Al → AlCl 3 + 3/2H 2 .…”

“…The chemical machining of aluminium and its alloys was used for decorative purposes in early applications, but industrial applications have come up around 1950's and continuously extended. Several studies have been conducted over chemical machining of aluminium [4][5][6][7][8][9][10][11][12]. Most of these reports mentioned limited etchants which are viable for industrial applications, while others had restricted opportunities.…”

“…A chemical machining temperature should be also maintained low, due to high heat generation during the process. The surface quality is also poor, and rougher surfaces have been reported [5,6]:…”

“…Sodium hydroxide (NaOH) is an alkali metal hydroxide type etchant for chemical machining of aluminium and its alloys [6,8,9]. This etchant provides faster machining performance comparing to FeCl 3 .…”

Imaging Technology, 5. Photochemical Machining

“…Thus, corrosion-resistant materials are difficult to etch and require extremely corrosive etchants. Some metals (tantalum, gold, titanium) [2] and alloys (Elgiloy and Duratherm 600, containing 43 wt % and 41 wt % cobalt, resp.) [3] fall into this category, together with ceramics [4], glass, and plastics.…”