Electroplating Aluminium thiab Aluminium Alloy Surface Treatment txheej txheem rau hluav taws xob cua sov raj

Electroplating Aluminium thiab Aluminium Alloy Surface Treatment txheej txheem rau hluav taws xob cua sov raj

Raus lub workpiece nyob rau hauv ib tug phosphating tov thiab undergo ib cov tshuaj tiv thaiv ntawm ib tug tej yam kub thiab txias los tsim ib txheej ntawm insoluble phosphate tiv thaiv zaj duab xis rau ntawm nws nto. phosphating zaj duab xis tuaj yeem txhim kho qhov adhesion ntawm txheej rau hlau thiab txhim kho corrosion kuj.

Muaj ob txoj hauv kev rau kev kho phosphating: immersion method thiab spray method. Txawm hais tias qhov zoo ntawm phosphating feem ntau nyob ntawm qhov zoo ntawm cov roj thiab xeb tshem tawm, cov txheej txheem tshuaj tsuag kuj yog ib txoj hauv kev zoo rau kev txhim kho qhov zoo ntawm phosphating thiab tuaj yeem ua rau lub sijhawm luv. Txawm li cas los xij, nws muaj qhov tsis zoo hauv qab no: ① vim qhov yooj yim corrosion ntawm cov cuab yeej los ntawm kev txaws; ② Yooj yim rau xeb ntawm cov txheej txheem; ③ Coarse crystals. Qhov zoo ntawm txoj kev immersion muaj xws li: ① ua tiav cov hom phiaj kev kho mob nyob qhov twg cov kua tuaj yeem ncav cuag; ② Ib qho yooj yim los tsim granular crystalline phosphate zaj duab xis nrog cov ntsiab lus hlau siab, uas muaj kev sib raug zoo nrog cathodic electrophoresis. Qhov tsis zoo ntawm txoj kev immersion muaj xws li: ① tsis muaj kev pab cuam ntawm scouring; ② Kev ua haujlwm qeeb qeeb.

At present, the foreign automotive industry generally adopts a combination of spray leaching process. Phosphating is generally classified according to composition, temperature, or thickness: ① Classification by solution composition: zinc series, zinc calcium series, zinc iron series, zinc manganese series, iron series, etc.; ② According to the temperature classification of the treatment solution: high-temperature phosphating (80-90 ℃), medium temperature phosphating (50-70 ℃), low-temperature phosphating (30-50 ℃), room temperature phosphating (energy-saving); ③ Classification by thickness of phosphating film: thick phosphating: σ≥ ten μ m. Film quality/>7.5g / m2 (tsim rau txias extrusion, xeb tiv thaiv, roj immersion, thiab hluav taws xob rwb thaiv tsev); Medium thickness phosphating: 5 μm< σ< ten μ m. Film quality 4.3-7.5g/m2 (suitable for manual painting); Thin phosphating: 11 μ m< σ< four μ m. Film quality 1.1-4.3g/m2 (suitable for electrophoretic painting, electrostatic spraying, and powder spraying); Extra thin phosphating: 0.3 μ m< σ< one μ m. Film quality 0.3-1.1g/m2 (suitable for high decorative electrophoretic primers).

www.superbheater.com