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| THE EFFECT OF BORON ON THE CORROSION RESISTANCE OF 70/30 BRASS |
| Sun Li Jiang Xiaoxia (Institute of Metal Research;Academia Sinica) |
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Abstract A new brass condenser tube containing trace boron ,which has been used in heat power station for more than four years,shows higher cor- rosion resistance than that of normal brass tubes.Therefore the anti- corrosion properties of 70/30 brass containing different amounts of boron with or without arsenic were investigated systematically.The measur- ements of corrosion weight loss and dezincification coefficient showed that the boron improved the corrosion resistance especially to dezinc- ification ,whether the brass contained arsenic or not.The optimum amount of boron in brass is 0.03～0.05wt.% in the absence of arsenic and 0.02～0.03wt.% in the presence of arsenic. An improved material with better corrosion resistance could possibly be developed by adding trace boron to brass with a certain amount of arsenic content.The improvement of corrosion resistance of this new kind of brass can be explained by the obstruction of boron to the diff- usion path of zinc for dezincification.
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Received: 25 August 1990
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[1] 周业蓉,腐蚀科学与防护技术,创刊号,P.28(1989)
[2] 张建中、姜晓霞,材料科学进展,3(5) ,425(1989)
[3] Toivanen,R.O.;Lindroos,V.K.,Proce.of the 9th ICMC,Torento,2,P621～526 (1984) |
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