Fig. 8From: The use of Robinia pseudoacacia L fruit extract as a green corrosion inhibitor in the protection of copper-based objectsA Coupon in the presence of Robinia pseudoacacia L inhibitor with a concentration of 1000 ppm after 30 days of immersion. ×60 magnification; B coupon in the presence of Robinia pseudoacacia L inhibitor with a concentration of 1800 ppm after 30 days of immersion. ×40 magnification (B)Back to article page