Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 3 (March 2018) 450-455    Article in Press

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  DEVELOPING OF CORROSION RESISTANCE NANO COPPER OXIDE COATING ON COPPER USING ANODIZATION IN OXALATE SOLUTION
 
M. H. Mahmood, Suryanto, M. H. F. Al Hazza and F. I Haidera
 
( Received: July 11, 2017 – Accepted in Revised Form: October 12, 2017 )
 
 

Abstract    Copper alloys are widely used in the manufacturing of heat transfer applications, this due to their excellent heat transfer properties. Copper contamination is one of the serious industrial problems in the boiler feed water system. This contamination commonly resulted from copper corrosion reactions in boiler feed water environment. The best way to reduce the copper contamination is by improving copper corrosion resistance. This research studies the developing of copper corrosion resistant by using anodization technique. The anodization experiments are conducted in oxalate solutions of concentrations from 0.1 to 0.5 M, at a temperature range from 24 to 0 ο C and applied potential from 7.5 to 9 V. Anodized coating analyzed using Field emission scanning microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. Characterization results referred to the formation of copper oxide anodized coating with grain size range from 25 to 68 nm. The corrosion resistance of the anodized copper samples carried out in simulated boiler feed water. Results show that the corrosion resistance of the anodized samples was enhanced. The corrosion protection efficiencies for the anodized coating increased 86.2% and 74.5% in testing solutions contains 3.5% NaCl, and 2 mg/l NH3, respectively.

 

Keywords    Copper corrosion, Copper oxide, Anodization technique, Corrosion protection

 

چکیده    خواص عالی انتقال حرارت مس، آن را در تولید تجهیزات مختلف برنامه های کاربردی انتقال حرارت استفاده می شود. آلودگی آب توسط مس در سیستم گردش آب یکی از مشکلات صنعتی جدی است [1]. این آلودگی معمولا ناشی از واکنش خوردگی مس در محیط آب خوراکی دیگ بخار است. آلودگی مس با افزایش مقاومت خوردگی مس در آب کاهش می یابد. در اين تحقيق، بهبود مقاومت به خوردگي مس با استفاده از روش آنوديزاسيون مورد بررسي قرار گرفته است. آزمایش های آنودیزاسیون در محلول های اگزالاتی از غلظت های 0.1 تا 0.5 M در محدوده دما از 24 تا C˚0 و پتانسیل اعمال شده از 7.5 تا V 9 انجام میشود. پوشش آنودایز با استفاده از میکروسکوپ اسکن انتشار میدان، اشعه ایکس پراکنده انرژی طیف سنجی و پراش اشعه ایکس بررسی شد. نتایج توصیفی به شکل گیری پوشش آنودایز اکسید مس با محدوده اندازه دانه از 25 تا 68 نانومتر اشاره کرد. آزمونهای مقاومت خوردگی نمونههای مس آنودایز در آب خوراکی دیگ بخار انجام شده است. نتایج نشان دهنده افزایش مقاومت به خوردگی نمونههای آنودایز است. راندمان محافظت در برابر خوردگی برای پوشش آنودایز در محلول های آزمایش حاوی 3.5 درصد اسید کلریدریک و mg / l 2 آمونیاک به ترتیب 86.2٪ و 74.5٪ افزایش یافته است.

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