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. 2020 Jan 2;13(1):184. doi: 10.3390/ma13010184

Figure 13.

Figure 13

Schematic representation of corrosion processes ongoing on the surface of the Fe-PEI material. (a) Polymer-coated sample on-air; (b) polymer-coated sample after immersion into Hanks’ solution—PEI layer disruption; (c) formation of corrosion pits after 12 weeks of biodegradation.