Corrosion resistance of mild steel in 0.5 M H2SO4 solution by plant extract of Alkana tinctoria: Experimental and theoretical studiesRajesh Haldhar, Dwarika Prasad, Akhil Saxena and Amanpreet KaurEur. Phys. J. Plus, 133 9 (2018) 356DOI: https://doi.org/10.1140/epjp/i2018-12165-0