From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating

Arman Dastpak,Sarah Höhn,Benjamin P Wilson,Mari Lundström,Sannakaisa Virtanen,Mariana Cecilio De Oliveira Monteiro,Kirsi Yliniemi

doi:10.3390/coatings8120454

Arman Dastpak, Sarah Höhn + Show 5 more

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In this study, a waste of biorefinery—lignin—is investigated as an anticorrosion coating on stainless steel. Corrosion behavior of two lignin types (hardwood beech and softwood spruce) was studied by electrochemical measurements (linear sweep voltammetry, open circuit potential, potentiostatic polarization, cyclic potentiodynamic polarization, and electrochemical impedance measurements) during exposure to simulated body fluid (SBF) or phosphate buffer (PBS). Results from linear sweep voltammetry of lignin-coated samples, in particular, demonstrated a reduction in corrosion current density between 1 and 3 orders of magnitude cf. blank stainless steel. Furthermore, results from cross cut adhesion tests on lignin-coated samples demonstrated that the best possible adhesion (grade 0) of ISO 2409 standard was achieved for the investigated novel coatings. Such findings suggest that lignin materials could transform the field of organic coatings towards more sustainable alternatives by replacing non-renewable polymer coatings.

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A shift from primary to secondary resources in the large-scale processes used in the metals or pulp and paper industries is essential in order to combat the declining availability of raw materials.it is necessary to follow the principles of circular economy in the development of sustainable industrial ecosystems, and, from this perspective, it is surprising how underutilized some of the side-streams of the biorefinery industries are
The coatings were investigated with fourier transform infrared spectroscopy (FTIR), in order to determine if any changes to the coating chemistry occurred either during the annealing or due to immersion in the simulated body fluid (SBF)
For both beech and spruce coatings, the characteristic bands related to lignin remained after both annealing and SBF exposure, which demonstrates the persistence of lignin adhesion on the stainless steel surface

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A shift from primary to secondary resources in the large-scale processes used in the metals or pulp and paper industries is essential in order to combat the declining availability of raw materials.it is necessary to follow the principles of circular economy in the development of sustainable industrial ecosystems, and, from this perspective, it is surprising how underutilized some of the side-streams of the biorefinery (pulp and paper) industries are. A shift from primary to secondary resources in the large-scale processes used in the metals or pulp and paper industries is essential in order to combat the declining availability of raw materials. In particular lignin, which is a very abundant natural polymer that provides the structural strength of plants [1,2] and has an annual production of approximately 100 million tons globally. Despite this high level of output, currently only 2% is utilized in value-added products, and the rest is predominantly burnt as a heat source in the integral processes of pulp/papermaking [3]. The primary applications of isolated lignin are surfactants, adhesives, and dispersants [3], fundamental research on possible applications of lignin is ongoing, including green replacements for plastics and packaging applications [4,5,6].

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