Fig. 9From: 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. ×20 magnification; B coupon in the presence of Robinia pseudoacacia L inhibitor with a concentration of 1800 ppm after 30 days of immersion. ×20 magnificationBack to article page