Green approach in anti-corrosion coating by using Andrographis paniculata leaves extract as additives of stainless steel 316L in seawater

Abstract

The analysis of anticorrosion coating by using Andrographis paniculata (kalmegh) leaves extract (KLE) as an additive to protect stainless steel 316L that immersed in seawater environment was successfully carried out. The anti-corrosive coating is the combination of selected binder, pigment, solvent, and additive. Andrographis paniculata leaves extract was selected as an additive due to excellent antioxidant properties. There are five types of coating with different concentration which are C1 (0 wt.%), C2 (3 wt.%), C3 (6 wt.%), C4 (9 wt.%) and C5 (12 wt.%). The coated substrate the immersed in seawater for 30 days and taken out for each subsequent 10 days for analysis. The analysis involves optical, electrochemical, and morphology studies. A few techniques involve including of Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PP) and scanning electron microscope with energy-dispersive X-ray spectroscopy (SEM/EDS). The result of FTIR shows several functional group presence in the KLE that can enhance anti-oxidation properties such as phenol, carboxylic acid, carbonyl, and amide. The presence of andrographolide compound obtained from UV-vis analysis at peak absorption spectrum 229 nm. Electrochemical analysis result from EIS, the most efficiency coating was predicted at C3. Hence, it has higher R ct value and low C dl value. The result in EIS is corresponding to PP; hence the result of corrosion rate at C3 is the lowest value, which is 0.00211 mm/year at 30 th day immersion. The observation on the surface morphology of the coating also shows that C3 that has a smooth surface with less pitting, cracks, and salt precipitate when compared to another coating. The addition of KLE increases the efficiency of anticorrosion coating with optimum concentration, which is 6 wt.%.

pH-induced wurtzite-zinc blende heterogeneous phase formation, optical properties tuning and thermal stability improvement of green synthesized CdS nanoparticles

“…Optical absorption studies are crucial in identifying an appropriate photocatalyst for light-driven pollutant degradation, which requires an adequate number of photons to be captured by the activity center [ [40] , [41] , [42] , [43] , [44] , [45] , [46] ]. UV–Vis spectrophotometry was utilized to determine the optical absorption of the present samples.…”

Potential Use ofPterocarpus santalinusBark Extracts as UV-Protective Coats onHevea brasiliensisWood

“…Synthetic additives (organic UV absorbers (UVAs) and inorganic metal oxide nanoparticles like CeO 2 and ZnO) are incorporated in coatings to protect wood from weathering degradation. − However, the leaching out of inorganic nanoparticles remains a major issue . They provide outstanding coating characteristics and improve substrate protection. , However, these synthetic organic and inorganic additives are primarily hazardous to human health and nature. The emission of volatile organic compounds (VOCs) from synthetic coatings too raises concern about their usage .…”

“…9 They provide outstanding coating characteristics and improve substrate protection. 10,11 However, these synthetic organic and inorganic additives are primarily hazardous to human health and nature. The emission of volatile organic compounds (VOCs) from synthetic coatings too raises concern about their usage.…”

Evaluating the performance of Andrographis paniculata leaves extract as additive for corrosion protection of stainless steel 316L in seawater

“…Moreover, KLE was also found out to be a mixed type inhibition with a dominant cathodic effect [20]. As a component in a coating, a research suggested that the incorporation of KLE as an additive yields a significant increase in coating performance when it is used up to 6 wt.%, and further addition caused a significant drop in the barrier quality [21].…”