Analisa perilaku korosi baja karbon rendah ASTM A36 dengan fungsi tegangan tarik menggunakan metode Electrochemical Impedance Spectroscopy (EIS) dan X-Ray Diffraction (XRD) = Analysis of ASTM A36 low carbon steel corrosion behavior with tensile stress function using Electrochemical Impedance Spectroscopy (EIS) and X-Ray Diffraction (XRD) method