Rust preventatives based on sodium, calcium, zinc, or barium sulfonates are commonly employed by manufacturers of metal products to protect their products from a variety of corrosion pathways. Although the films are nearly imperceptible, the protection they provide can last several months to a year or more depending on the environment. Historically, barium-sulfonate-based rust preventatives have been touted as superior products as compared to other alkali metal sulfonates. These barium-based products, however, can be a disadvantage to users and manufacturers due to the higher cost of barium waste disposal. Future environmental regulations are expected to tighten, but there has been a reluctance to switch from barium-based products by the manufacturing segment due to a perceived performance advantage. Accelerated testing methods have been employed to demonstrate that calcium-based rust preventatives can provide equal or better performance than barium-based products. Performance of the materials was measured against industry standard controls.

Subject
Films, Paint removal, Corrosion prevention, Test methods, Water, Sulfonates, Metal surfaces, Liquids, Fluids, Metals, Rust, Corrosion protection, Paints
Keywords:
Rust preventatives, calcium sulfonate, barium sulfonate, surface preparation
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2012
Association for Materials Protection and Performance (AMPP)
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