Rack in the preparing work before spraying

Network cabinet, as we all know, the production process is: skim to water, alkali wash - a wash - secondary washing - and - washing process, however, if we didn't meet on surface of processing a certain technological requirements of so many subsequent steps, will be unable to, because of the uneven surface, directly affects the surface spraying cabinet beautiful sex. So before spraying pretreatment is very important. We exist to clean off the aluminum surface dirt and defects such as dust, metal oxide and residual oil, fingerprints, mild stroke ( Brush) Injury, etc.
usually we will use four methods.
1, degreasing degreasing process is usually referred to as oil removal, its purpose is to remove process of lubricating oil, rust-proof oil and other contaminants on the surface of the aluminum, to ensure the uniform corrosion and alkali corrosion process of aluminum surface bath clean.
2, dissolving 35 - commonly used caustic corrosion 100 g/L of NaOH to deal with fluid, its purpose is to get rid of dirt on the surface of the aluminum and the aluminum metal surface under the natural oxidation film substrates bare, facilitate the smooth progress of oxidation. The process for the whole of the biggest chinalco dissolving process of surface treatment process, the corrosion amount approximately 20 microns, processing aluminum soluble aluminum 50 g per square metre. When the amount of soluble in alkali solution for 30 g/L produces aluminum hydroxide precipitation, piling up on the bottom of the channel to form hard solids. To prevent precipitation, usually added in the production of sodium citrate and sodium gluconate ( 1. 5g/L) 。
3, and after the purpose is mainly to remove alkali corrosion residual corrosion on the surface of the aluminum, black spot, to obtain a polished metal surface, also have a function of neutralizing alkali liquor. Commonly used neutralization liquid for HNO3 ( Relative density 1. 42) 100 - 400 g/L or - H2SO4 ( Relative density 1. 84). 100 - 200g/L。
4, water washing between each working procedure with flowing water washing, aims to remove residual liquid on the surface of the products and the reaction products of soluble in water, prevent tank liquid contamination of next working procedure, to ensure the efficiency and quality of processing.
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