Acid etch Definition
Acid Etching is the latest production method of manufacturing sign plates. Using computer cut stencils onto aluminum, brass and various other metals, these are then ‘dipped’ into acid to create the etching effect. This Acid Etched manufacturing gives a very accurate and classy finish that is widely used in the legal and medical professions because of the stylish look.
Once the plates have been etched and filled they can be supplied with a mahogany backing board for the traditional honorary look, or with holes for fitting directly onto a wall or with stand-off wall mounts for the more contemporary style.
It is widely used by government agencies, aerospace industries and shipping companies. The standard surface also has great UV stability lasting 20 years plus.
Aluminium has a density of 2.7 g/cm3 and therefore belongs to the light metals. Its crystal structure is cubic face centred.
Due to its high electric conductivity, aluminium is used for conductors in microelectronics where it is often alloyed with copper in order to prevent migration.With a standard potential of -1.66 V, aluminium does not belong to the noble metals.
Aluminium etching is highly exothermic, under etching of the resist mask causes local heating and super-proportional under etching of the mask as a consequence, if no agitation is performed.
Strong H2-bubbling reduces etch homogeneity. Improvements of the etch rate homogeneity can be achieved if the etching will be interrupted every approx. 30 seconds by a short dip into DI water. hereby, the H2 bubbles temporarily vanish.
Generally, etching starts after the dissolution (by H3PO4) of few Al2O3 film present on every Al surface. For this reason, the photo-resist processing impacts on the Al etching: The alkaline developers preferentially dissolve the Al2O3 where the resist is primarily through developed .
Dependant on the extent of (desired or undesired) over-developing as well as delay between development and Al-etching, the process parameters may lead to a spatial in homogeneous Al etching start.
Aluminum details :
Alloy 5052 Temper H38
Chemical Composition Limits (%)
Magnesium gives this alloy its enhanced corrosion resistance, work ability, strength, and weld ability. Typical uses include aircraft fuel tanks, electronic mounting plates and panels, fan blades, refrigeration liners, storm shutters, and utensils.
Mechanical Property Limits