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An In-Situ Phosphating Coating Catalyzed by Phenylphosphonic Acid on AA6061


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The results of potentiodynamic polarization curves and salt water immersion (SWI) test reveal that phenyl phosphonic acid (PPA) as an in-situ phosphating reagent (ISPR) can effectively improve the corrosion resistance of alkyd ready-mixed paint coating formed on AA6061 in the 3.5% NaCl solution. However, the corrosion resistance of the in-situ phosphating coating (ISPC) is relevant to the contents of phenyl phosphonic acid (PPA) in alkyd ready-mixed paint coating.

In order to solve the problems of that exist in traditional multi-stage phosphating process (such as error-prone operation, cost and waste), a novel in-situ phosphating coating (ISPC) system was developed. This was achieved by predispersing an optimum amount of in-situ phosphating reagent (ISPR) into the paint formulation.

The corrosion protection performance of the ISPC comprised of alkyd ready-mixed paint catalyzed by phenylphosphonic acid (PPA) as in-situ phosphating reagent (ISPR) was investigated using electrochemical measurement and salt water immersion (SWI) test.

The results indicated that adding 2% phenylphosphonic acid in alkyd ready mixed paint system can obviously improve the corrosion protection performance of the paint coating cured at 50°C for 8h

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