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Fig.11 Salt spray test results of different polyaniline doped particle samples at 120 h: (a1-a6) AZ91D samples after 0, 24, 48, 72, 96, and 120 h; (b1-b6) Non-doped samples after 0, 15, 40, 64, 88 and 120 h; (c1-c6) 3g-doped samples after 0, 15, 40, 64, 88 and 120 h