室温条件下690TT合金的极化曲线表明，加入氧化铅能导致合金表面钝化膜不稳定。静态高压釜高温含铅碱液中的浸泡实验表明，在330℃的10% NaOH+10 g/L PbO含铅碱液中，690TT合金发生晶间腐蚀，试样失重，且试样表面越粗糙，腐蚀越严重。其中线切割样品由于残余应力和腐蚀产物楔入应力的综合作用，晶间腐蚀发展成为沿晶应力腐蚀开裂。在330℃的10% NaOH碱液中，690TT合金没有发生晶间腐蚀。
A small amount of PbO could induce the passive film of alloy 690TT unstable in the caustic solutions at room temperature. The immersion tests were carried out in high temperature lead-containing caustic solutions in a static autoclave. The results showed that alloy 690TT immersed in 10% NaOH+10 g/L PbO solution suffered from intergranular attack (IGA) at 330℃, and the specimens lost weight. The coarser the original surface of the samples, the more serious the samples suffered from corrosion. IGA was observed and developed as intergranular stress corrosion (IGSCC) with respect of residual stress. While no IGA was found for the samples immersed in 10% NaOH solution at 330℃.
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