Aluminum is much softer metal than cast iron. If the castings are subjected to sandblasting, the same medium and / or pressure that work well on cast iron can be too aggressive for aluminum. Similarly, softer carriers that do not etch and do not remove the metal on aluminum parts, may be not aggressive, if they are used to remove carbon and rust on cast-iron castings.
Cast iron heads and blocks easily withstand from 650 to 750 degrees in thermal cleaning furnaces. High temperatures are very effective for converting oily and fat deposits in the ash, which can later be removed by an airless shot blasting method, inkjet cleaning or washing. But aluminum can soften if it is exposed to the temperature of 500 degrees Fahrenheit or higher for more than an hour or two. For this reason, the temperature inside the purification furnace should be limited when cleaning aluminum heads and blocks.
High temperatures inside the cleaning furnace can also loosen the saddles and the valve guides in aluminum heads. If the seats and guides are still replaced, this is not a problem. However, if the original seats and guides are reused, and you do not want them to fall out, thermal cleaning may not be the best option.
One of the biggest problems with cleaning aluminum heads, blocks and other parts is the restoration of a new type. Aluminum spots are blew quite easily. The oxide layer, which is formed on the metal surface, as soon as it is exposed to air, protects the metal from further corrosion, so there is no need to paint aluminum. But over time, the coating becomes dim and may even become black if the part is exposed to excessively caustic chemicals during the cleaning process.
Aluminum with inkjet processing with glass balls, crushed aluminum oxide or steel fraction (stainless steel works well, but expensive), can eliminate color change. But this requires an additional cleaning step to make sure that no beads, sand or fraction will not be left in any of the secluded corners and the castings gaps.
Masking of the guide valve and openings of the cooling shirt before shot blasting or sandblasting can reduce the risk of maintaining the medium. Despite this, crushing or shot blasting processing remove the metal and clean the surface, giving the casting matte and slightly dim. Depending on the fact that your client wants (or expects), for this it may be necessary to take another step in the process of re-finishing, if you need to spray aluminum casting or silver paint. The site https://x100casino.com contains the best 100 online casinos in the world