有機酸塩添加有機アルカリ性浴(1-アミノ-2-プロパノール-フッ化物基液)中でのアルミニウムの陽極酸化 [in Japanese] Anodizing of Aluminum in Organic Alkaline Baths (1-Amino-2-Propanol-Fluoride Base) Containing Organic Acid Salts [in Japanese]
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In this paper, the anodizing of aluminum was investigated using isopropanolamine (1-amino-2-propanol) for comparison with ethanolamine and choline. Studies were conducted to determine the optimum bath compositions for anodizing aluminum in isopropanolamine alkaline baths involving ammonium fluoride and organic acid salts (HCOONH<sub>4</sub>, CH<sub>3</sub>COONH<sub>4</sub>, (NH<sub>4</sub>)<sub>2</sub>C<sub>2</sub>O<sub>4</sub>, (NH<sub>4</sub>)<sub>2</sub>C<sub>4</sub>H<sub>4</sub>O<sub>6</sub>, (NH<sub>4</sub>)<sub>3</sub>C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>, (CH<sub>2</sub>)<sub>4</sub>(COONH<sub>4</sub>)<sub>2</sub>). Uniform films were formed when anodizing in baths containing organic acid salts, but non-uniform films were formed in baths without these additives. The thickest film (about 8μm) was formed in a bath containing ammonium acetate and ammonium tartrate by anodizing for 30min at 20°C with a current density of 1A/dm<sup>2</sup>. Films formed in baths containing ammonium tartrate or tri-ammonium citrate were the hardest (Marten's scratch hardness test, load 50gf, about 19) while films formed in baths containing tri-ammonium citrate or ammonium adipate showed lower corrosion resistance. SEM observation found that films prepared in baths containing monocarboxylic acids salts had a few pores about 25-40nm in diameter in addition to those with diameters of 15-20nm, while these prepared in baths containing other organic acid salts had pores about with diameters of 30-40nm.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 48(1), 76-81, 1997-01-01
The Surface Finishing Society of Japan