1. Aluminum Phosphating
The influence of various additives such as accelerators, fluoride, Mn²âº, Ni²âº, Zn²âº, PO₄³â», and Fe²⺠on the phosphating process of aluminum was investigated using techniques like SEM, XRD, potential-time curves, and membrane weight analysis. The study revealed that cerium nitrate exhibits excellent water solubility, requires a low dosage, and forms a film quickly, making it an effective accelerator for aluminum phosphating. Fluoride was found to enhance film formation, increase membrane weight, and refine grain structure. Meanwhile, Mn²âº, Ni²âº, and Zn²⺠significantly refined the grains, resulting in a more uniform and compact phosphating film with improved appearance. At low concentrations, Zn²⺠did not promote good film formation, but as its concentration increased, so did the membrane weight. Additionally, the content of PO₄³⻠had a significant impact on the membrane weight, with higher levels leading to heavier films.2. Alkaline Electro-Polishing Process
Research was conducted on an alkaline polishing solution system, comparing the effects of corrosion inhibitors and viscosity agents on the polishing outcome. A highly effective alkaline solution was successfully developed, along with an additive that extended the solution's lifespan and enhanced the polishing quality. Experimental results demonstrated that adding suitable additives to NaOH solutions can significantly improve the polishing effect. Exploratory experiments also showed that under specific conditions, DC constant voltage electropolishing using a glucose-containing NaOH solution could achieve a surface reflectance of up to 90%. However, some instability issues were observed, indicating the need for further investigation. The feasibility of using a DC pulse electropolishing method under alkaline conditions was also explored, revealing that while it could achieve leveling similar to DC constant pressure polishing, its speed was slower.3. Environmentally Friendly Chemical Polishing of Aluminum and Its Alloys
A new environmentally friendly chemical polishing technology based on monosulfuric acid phosphoric acid was developed, aiming to eliminate NOx emissions and overcome the quality issues of previous methods. The key innovation involved replacing nitric acid with special compounds in the base solution. To achieve this, the chemical polishing process of triacid aluminum was analyzed, particularly the role of nitric acid. Nitric acid primarily suppresses pitting corrosion and enhances polishing brightness. Based on tests with simple mono-phosphoric acid, it was concluded that the added substances should effectively suppress pitting and reduce general corrosion while providing good leveling and brightening properties.4. Electrochemical Surface Strengthening Treatment of Aluminum and Its Alloys
This study focused on the process, properties, morphology, composition, and structure of films formed on aluminum alloys through anodizing and deposition in a neutral system. The film formation mechanism was preliminarily explored. Results indicated that in a neutral mixed system containing Na₂WO₄, the optimal concentration of the film-forming accelerator was between 2.5–3.0 g/l. The complex membrane concentration ranged from 1.5–3.0 g/l, and the Na₂WO₄ concentration was between 0.5–0.8 g/l. With a peak current density of 6–12 A/dm² and weak stirring, a uniform, glossy gray inorganic non-metallic film was obtained. This film had a thickness of 5–10 μm and a microhardness of 300–540 HV, exhibiting excellent corrosion resistance. The neutral system demonstrated good adaptability to various aluminum alloys, including rust-proof and forged aluminum, enabling the formation of high-quality films.5. Surface Treatment Technology for YL112 Aluminum Alloy
YL112 aluminum alloy is widely used in structural components of automobiles and motorcycles. Before application, surface treatment is essential to improve corrosion resistance and create a surface layer that facilitates bonding with organic coatings. This process ensures better adhesion and long-term performance of the final product.
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Tags: chemical polishing, phosphating film, film forming base liquid, aluminum
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