不同状态FeCr8P13B5和FeCr8P13C7合金的耐蚀性能

本文以电化学方法(动电位极化曲线测量)和全浸法考察了不同状态(无定形态、无定形合金退火态以及晶态)FeCr8P13B5和FeCr8P13C7合金在氯离子介质中的耐蚀性能,结果表明(1)无定形FeCr8 P13 B5和FeCr8P13C7合金都具有优异的耐蚀性能。它们的动电位极化曲线十分相似,当极代电压为+1.5伏(SCE)以下时。试样不出现破裂电位Eb,钝态电流维持在10微安/厘米~2以下;这两种无定形耐蚀合金在30℃的0.5N-2.5NHCl、40和60℃的10％,FeCl_3、6H_2O、60℃的3.5％NaCl以及30℃的1MH_2SO_4+0.5MNaCl中全浸168小时其腐蚀速率为10~(-3)-10~(-4)毫米/年。(2)无定形FeCr8P1385和FeCr8P13C7合金经500℃1小时真空退火(晶化)处理后,后者的耐蚀性能急剧恶化,而前者仍保持无定形状态的优异耐腐蚀性能。电化学测量与全浸试验所得的结果是一致的。

The Corrosion Resistance of Fe Cr8 P13 B5 and Fe Cr8 P13 C7 Alloys in Different States

The corrosion resistance of Fe Cr8P13 B5 and FeCr8 P13 C7 alloys in different states have been investigated in the media containing chlorine ions by electrochemical measurement and total immersion test. Experimental results showed that: (1)The amorphotis Fe Cr8 P13 B5 and Fe Cr8 P13 C7 alloys have excellent corrosion resistance. The polarization curves of both amorphous corrosion resistant alloys are much similar measured in 3.5% NaCl at 30℃ by potentio-kinetic method. No breakdown potential(E_b) was observed within the measured region from-1.0 to+1.5 volts(SCE)and their anodic current densities maintain low level,less than 10μA/cm~2;The corrosion rates of both amorphous alloys are lower than 10~(-3)—10~(-4)mm/y in all immersion testing environments such as 3.5%0 NaCl at 60℃, 0.5—2.5N HCl at 30℃, 10% FeCl_3·6H_2O at 40 and 60℃ and 1M H_2S_O4+0.5MNaCl at 30℃. (2) After vacuum annealing treatment at 500℃ for 1 hour, the corrosion resistance of Fe Cr8 P13 C7 alloy dropped abruptly, while that of Fe Cr8 P13 B5 alloy remained as good as in the amorphous state. Electrochemical measurements and immersion test results agree very well.