Durability of a polypropylene/graphene oxide nanocomposite coating

A recently pubished work focues on a long-term experimental evaluation and molecular dynamics simulation of a polypropylene/graphene oxide nanocomposite coating in 3.5 wt% NaCl solution.

Rain pattering on a black surface as a symbolic image.
The weathering performance of an epoxy coating could be improved. Image source:  Sourabh Yadav - Pixabay (symbol image).

Most organic coatings lose their resistance over time. In a new work, a super-hydrophobic polypropylene (PP) coating was developed by dip-coating method to avoid destructive agents penetration into the mild steel substrate and provide long-term corrosion protection.

Durability peformance

Graphene oxide (GO) was put in the PP matrix to improve corrosion durability by reducing wettability. PP grafted with maleic anhydride (PP-g-MAH) was also utilised to elevate the bond strength and adhesion of the coating to the undercoat. The PP coating with 50 wt% PP-g-MAH and 0.1 wt% GO (named as PP/PP-g-MAH/GO-0.1) illustrated the best durability performance after 30 days of immersion by corrosion resistance of 5200 Ω·cm2, which is 25 times greater than the pure PP sample.

Moreover, the positive effect of the GO on the efficiency of the PP/PP-g-MAH/GO-0.1 sample was proved by maintaining super-hydrophobicity after 1 week of immersion (water contact angle of 152°).

The study has been published in Progress in Organic Coatings, Volume 164, March 2022.

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