Higher salt spray corrosion resisting natural color anode oxidation film treatment technology

Abstract

The invention relates to a higher salt spray corrosion resisting natural color anode oxidation film treatment technology which comprises the steps of (1) charging, (2) alkali corrosion, (3) duplex water washing, (4) water washing, (5) chemical polishing, (6) duplex water washing, (7) water washing, (8) bright dipping, (9) water washing, (10) water washing, (11) pure water washing, (12) anode oxidation, (13) water washing, (14) water washing, (15) pure water washing, (16) nickel salt hole sealing, (17) duplex water washing, (18) pure water washing, (19) passivation, (20) duplex water washing, (21) water washing, (22) pure water washing, (23) drying, and (23) blanking. The technology is simple in processing, less in investment and low in energy consumption, improves the property of a film layer greatly, and can resist neutral salt spray corrosion for above 600H, so that the field of applications of aluminum alloy anode oxidation is expanded and improved.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface anticorrosion treatment, in particular to a natural color anodic oxidation film treatment process resistant to high-level salt spray corrosion. Background technique [0002] At present, the domestic aluminum alloy anodic oxide film has different grades such as 96H, 120H and 240H in terms of performance requirements for neutral salt spray corrosion resistance (NSS test). The anodic oxide film prepared by traditional nickel salt sealing, NSS test Usually only 96-240H, mostly used for interior decoration products, such as notebook computers, mobile phone casings and home appliances. [0003] The traditional body process is as follows: (1) feeding; (2) ultrasonic degreasing; (3) washing; (4) washing; (5) alkali etching; (6) double washing; (7) washing; (8) Neutralization; (9) washing; (10) washing; (11) chemical polishing; (12) double washing; (13) washing; (14) light; (15) washing; (16) washing...

AI Technical Summary

Problems solved by technology

[0005] 1. The pretreatment process of the above-mentioned process is too complicated, which makes the production process longer and increases the working hours, resulting in high cost, which does not conform to the advocacy concept of low-carbon emission reduction

[0006] 2. The thickness of the oxide film prepared by the above process is generally 12±2 microns, and the oxidation time is more than 35 minutes. Due to the long oxidation time, the production cycle is slowed down, the energy consumption is increased, and the working hours are lengthened, that is, the cost is high and the efficiency is low.

[0007] 3. The anodic oxide film prepared by the above process has insufficient neutral salt spray corrosion resistance, generally not exceeding 240H, and is mostly used in interior decorative products, and outdoor decorative products that require high anti-corrosion performance, such as automotive exterior parts , construction engineering, shipbuilding and other fields performed poorly

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