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The problem of corrosion in factories and vital installations remains one of the most important obstacles that delay the progress of production and the increasing of its quantity. To solve the problem of corrosion, many inorganic and organic inhibitors have been used. Recently, inhibitors made from plant extracts, cheaper and environmentally friendly, were used. The inhibition of pumpkin seed extract on the corrosion mild steel alloy in the acidic medium was investigated using spectroscopy of the electrochemical impedance, Electrochemical technique and mass losing method with a static environmental aqueous acidic solution. Effect of inhibitor concentrations (10-50 mg/L) and immersion time (1-5 h) was studied on the inhibition efficiency (η%) of the extract on Mild Steel (MS) immersed in a 0.5 M HCl solution. All techniques showed very good matching results in the inhibition coefficient values. The optimum η% was in the range 71-76% depending on the method used. The optimum time was 5 hours. Tafel curves results showed a clear view of the extract behavior, which acts as a mixed-type inhibitor. Furthermore, the atomic force microscopy test was applied for studying surface morphology of alloy. From the foregoing, the pumpkin plant extract can be of great benefit in inhibiting corrosion in the industry. [ABSTRACT FROM AUTHOR]

The present paper describes the synthesis of four azo-Schiff base named (1a-4a) by diazotization reaction of the synthesized Schiff bases with sulfonamide compound. All new synthesized derivatives were identified by melting points, CHNS, FT-IR and 1H-NMR spectra. All compounds were tested for their antibacterial activity that showed good activity. The synthesized compounds were used as sensitive and selective analytical reagent for the spectrophotometric determination of cadmium (II). The calibration curve is linear between 0.05 and 30 μ g.ml-1 and limit of quantification, LOQ of (1.203, 1.078, 1.443 and 0.875) μ g.ml-1 with molar absorptivity and Sandal's sensitivity values of ligands 2.4778x104, 1.6740x104, 1.70019x104, 1.9002 x104 L mol-1 cm-1 (0.049x10-4, 0.169x10-4, 0.132x10-4, 0.110 x10-4 μ g.cm-2, for 1a, 2a, 3a and 4a, respectively. The composition of the Cd (II) - (1a, 2a, 3a and 4a) complex is established as 1:2 by molar ratio and job methods. An excellent linearity with a correlation coefficient value of (0.9997, 0.9996, 0.9974 and 0.9985) is obtained for the complexes. [ABSTRACT FROM AUTHOR]