Modified barium metaborate: A non‐lead, non‐chromate corrosion inhibitor for Alkyd Paints

Modified barium metaborate (BMB) was originally developed and patented as a mould inhibitor for oleoresinous systems. It was noted from exposures on our test fence that the product exhibited definite corrosion inhibiting properties. Through this observation further studies were initiated and it was determined that BMB was an excellent corrosion inhibitor in both latex and oleoresinous systems. Its effectiveness as a corrosion inhibitor is usually attributed to (1) its alkalinity which neutralizes the acidity of weathered paint films and which may reduce the reactivity of metal substrates, and (2) the metaborate ion which passivates the anode in essentially the same manner as the chromate ion.