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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。
In this paper, the corrosion resistance of FeCr8P13B5 and FeCr8P13C7 alloys in different states (amorphous state, amorphous alloy annealed state and crystalline state) in chloride ion medium was investigated by electrochemical method (potentiodynamic polarization curve measurement) and immersion method. Results It shows that (1) amorphous FeCr8 P13 B5 and FeCr8 P13C7 alloys all have excellent corrosion resistance. Their potentiodynamic polarization curves are very similar when the generation voltage is below +1.5 volts (SCE). The sample does not appear the rupture potential Eb, the passivation current is maintained at 10 microamperes / cm ~ 2; these two amorphous corrosion resistant alloys at 30 ℃ 0.5N-2.5NHCl, 40 and 10% at 60 ℃, FeCl_3, 6H 2 O, 3.5% NaCl at 60 ℃ and 1MH 2 SO 4 + 0.5M NaCl at 30 ℃ for 168 hours. The corrosion rate is 10 -3 -10 -4 mm / year. (2) After the amorphous FeCr8P1385 and FeCr8P13C7 alloys were annealed in vacuum at 500 ℃ for 1 hour, the corrosion resistance of the latter deteriorates rapidly, while the former still retains the excellent corrosion resistance in the amorphous state. Electrochemical measurements and immersion test results obtained are consistent.