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采用静态高压釜腐蚀试验研究了在S5(Zr-0.8Sn-0.4Nb-0.4Fe-0.1Cr)锆合金基础上添加Cu的S5+x Cu(x=0~0.5,质量分数,%)合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能,用TEM和SEM分别观察了合金和氧化膜的显微组织。结果表明,在S5合金中添加Cu对其在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能是有害的,特别是当S5合金中添加的Cu含量超过0.2%时,合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能会随Cu含量的增加而急剧恶化,这主要是因为此时合金中含有富铜的Zr_2Cu型相析出,这种Zr_2Cu型相对锆合金在360℃/18.6 MPa/0.01 M LiOH水溶液中的耐腐蚀性能非常有害。
The static autoclave corrosion test was carried out to study the effect of adding S5 + x Cu (x = 0 ~ 0.5, mass fraction,%) on the basis of S5 (Zr-0.8Sn-0.4Nb-0.4Fe-0.1Cr) zirconium alloy 360 ℃ / 18.6 MPa / 0.01 M LiOH aqueous solution. The microstructure of the alloy and oxide film were observed by TEM and SEM respectively. The results show that adding Cu to the alloy S5 is harmful to the corrosion resistance of the alloy in 360 ℃ / 18.6 MPa / 0.01 M LiOH aqueous solution. Especially when the Cu content in the S5 alloy exceeds 0.2% /18.6 MPa / 0.01 M LiOH solution corrosion resistance with the increase of Cu content of the sharp deterioration, mainly because of the alloy containing copper-rich Zr2Cu-type precipitation phase, the Zr2Cu relative zirconium alloy at 360 ℃ /18.6 MPa / 0.01 M LiOH Corrosion resistance in aqueous solutions can be very detrimental.