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Effect of dispersing auxiliaries, namely polyvinylp rrolidone (PVP), Lauryl dodecyl sulfate sodium (SDS), nonionic surfactant op-10 (Op-10), C1 2-14 alcohol ethoxylate AE7 (AE7) and polyethylenimine (epomin) on the nanosilica dispers ion into passive Cr(III) solution, pH = 1.5, were investigated by FT-IR, zeta potential, particl e-size distribution and natural salt spray testing. The obtained results indicated that passiv e Cr(III)-nanosilica solution after 7-day fabrication was uniform, having no agglomeration if using SDS, PVP and AE7 agent. AE7 saw the best dispersion aid ability for dispersing nano silica into passive Cr(III) solution in those dispersing auxiliaries studied. Conversion coating fabricated from passive Cr(III)-nanosilicaAE7 solution had a highest level of anticorrosion d urability. White rust appeared on X-Cut position of sample fabricated from former solution after 9-day natural salt spray testing, which was the longest in all of samples. However, average particle size of nanosilica in passive Cr(III)nanosilica-AE7 solution was approximately 60 nm, wh ich was quintuple initial average nanosilica size. Hence, AE7 could help nanosilica d ispersion into passive Cr(III) solution but effect of AE7 was not strong enough to disperse nan osilica well into solution as well as maintaining the stability for new system.

EFFECT OF SOME DISPERSING AUXILIARIES ON NANOSILICA DISPERSION INTO PASSIVE CHROME TRIVALENT SOLUTION