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The corrosion behavior on commercial stainless steel SS 304 in nanofluids water-Al2O3 system at pH 3 until 7 conditions have been investigated using electrochemical methods. The electrochemical tests were performed with and without the addition chlor to adjust of pH nanofluid condition, which are acidic (pH 3.2,4, 5.6) and neutral (pH 7) at ambient temperature. The electrochemical technique used in this study, were open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of open circuit potential tests showed that the corrosion potential (Ecorr) values of stainless steel 304 at four pH values are slightly different between pH neutral and acidic. The chromium oxide (Cr2O3) film formed on stainless steel is more stable in neutral than in acidic with the presence of Cl. This shows that the interaction between nanofluids and the stainless steel have no significant effect onto its corrosion behavior. However, potentiodynamic polarisation of stainless steel SS 304 in nanofluid with the absence of Chlor showed the lowest corrosion than stainless steel at condition in acidic pH. Eis study shows that stainless steel SS 304 in nanofluid with the absence of Chlor (neutral) showed the higher impedance than stainless steel at condition in acidic pH. The higher impedance indicated that the passive film of Cr2O3 formed on the surface of stainless steel. In terms of corrosion rate values, stainless steel alloy showed the best corrosion rate in neutral pH nanofluid compare acidic pH.