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Register a new userNew method for sealing sulphuric acid anodized aluminium films
طريقة جديدة لختم طبقات الألمنيوم المؤكسد أكسدة مصعدية بحمض الكبريت
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عصام القلق( باحث )
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استخدمت مزائج من خلات الأمونيوم و طرطرات الأمونيوم بوجود كلوريد بنزيل ألكيل ثنـائي ميتيـل أمونيوم لختم طبقات الألمنيوم المؤكسدة أكسدة مصعدية بحمض الكبريت. و لقد أظهرت خلات الأمونيـوم تأثيراً تآزرياً مع طرطرات الأمونيوم أكسب سطح الألمنيوم المؤكسد حماية ممتازة و دائمة ضد التآكل، كما أظهرت طرطرات الأمونيوم تأثيراً تآزرياً مع كلوريد بنزيل ألكيل ثنائي ميتيـل أمونيـوم (كلوريـد بنـز ألكونيوم) أدى إلى تثبيط تشكل ما يسمى البوهيمايت. و لقد أجريت دراسة لجودة و ديمومـة خـتم سـطح الألمنيوم المؤكسد بالطريقة الجديدة باستخدام اختبارات مراقبة جودة الختم القياسية و الاختبار المعـروف باسم (salt- salt-spray(fog) test (ASTM B117-97.
Mixtures of ammonium acetate and ammonium tartrate in the presence of benzyl alkyl dimethyl ammonium chloride (benzalkonium chloride) were used for sealing sulphuric acid anodized aluminium. Mixtures of ammonium acetate and ammonium tartrate exhibited synergistic sealing effect, which offered excellent durable corrosion protection to the surface coating formed by anodizing the aluminium alloy. Moreover the synergistic effect of benzalkonium chloride with tartrate offered boehmite free sealed surface coating. Quality and durability of the sealed aluminium oxide films have been assessed using standard control sealing quality tests and well-known salt- spray (fog) test (ASTM B 117-97).
References used
Wernik, S., Pinner, R.and Sheasby, P., The Surface Treatments of Aluminium and it's alloys. ASM Internationals and Finishing Publications Ltd, 5th edn., Metals Park,Ohio, (1987) pp. 773-856
Hoar,T.R and Wood,G.C.,Elrctrochim.Acta,1962,7,333
Lorenz, W.G. and Mansfeld, F.,Corros.Sci.1981,21,647
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