US extends China corrosion-inhibitor anti-dumping duties after sunset review
The U.S. Department of Commerce has completed its expedited first sunset review of the antidumping duty order on certain corrosion inhibitors from China and determined that revoking the order would likely lead to continuation or recurrence of dumping. The order remains in effect, maintaining tariffs on Chinese corrosion-inhibitor imports. Shippers and importers sourcing these products from China must continue factoring existing anti-dumping duties into landed-cost calculations and customs-duty compliance planning.
Photo: Echo Zhang / PexelsThe U.S. Department of Commerce announced on May 19, 2026, the final results of its expedited first sunset review of the antidumping duty order covering certain corrosion inhibitors from the People's Republic of China. In its decision, Commerce found that "revocation of the antidumping duty (AD) order on certain corrosion inhibitors (corrosion inhibitors) from the People's Republic of China (China) would be likely to lead to continuation or recurrence of dumping, at the levels indicated in the 'Final Results of Sunset Review' section of this notice."
Sunset reviews are mandatory administrative proceedings conducted on orders that have been in effect for five years. Commerce must determine whether terminating the anti-dumping duties would likely result in a return to dumping. The agency's affirmative determination means the antidumping duty order on corrosion inhibitors from China remains in place.
Corrosion inhibitors—chemical compounds used to prevent or slow corrosion in metalworking fluids, coatings, and industrial applications—typically fall under HS chapter 38 (miscellaneous chemical products). Importers sourcing these products from Chinese suppliers are subject to the applicable anti-dumping duty rates that Commerce has established through prior investigations and reviews.
The continued imposition of anti-dumping duties means that U.S. importers will face higher landed costs for Chinese corrosion inhibitors compared to sourcing from non-subject countries. The specific duty rates, country-of-origin issues, and valuation of subject merchandise must be accounted for in customs-entry preparation and cost modeling.
What this means for shippers
Importers purchasing corrosion inhibitors from China must ensure their customs declarations and landed-cost estimates include the applicable anti-dumping duties. Verify that your suppliers are properly identified as subject or non-subject entities, and confirm HS classification for your specific corrosion-inhibitor product. Review your sourcing strategy—shifting to non-China suppliers may reduce duty exposure. Update your cost models immediately with Commerce's final-review rates.
