Partial Substitution of Chromate by Borate for Cooling Water Inhibition

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Chromate is an effective and versatile inhibitor for industrial cooling water systems. Due to its toxicity, borate is added systematically to substitute chromate from 100 to 1% and tested as inhibitor for a mild steel, using radioactive tracer technique.<br> The amount of chromium in the film thickness of the inhibitor formed on the specimens is found to increase as borate concentration is increased up to 40% and decreases thereafter. The protection is obtained at 303 K at least up to 6 h. By reducing chromate from 100 to 60%, the Cr content in the protective film is found to double in 2–4 h, which shows the synergistic effect of the inhibitor formulation as compared to that of chromate alone.


  • Transactions of the Iron and Steel Institute of Japan  

    Transactions of the Iron and Steel Institute of Japan 38(5), 469-473, 1998-05-15 

    The Iron and Steel Institute of Japan

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