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图4 不同温度浸泡实验样品的腐蚀形貌

Fig.4 OM (a-c) and SEM (d-f) morphologies of the soak tested samples in 3.5%NaCl solution at 30 ℃ (a, d), 50 ℃ (b, e), 70 ℃ (c, f)