研究了不同化学处理对高pH硬水氧化锌表面的影响。锌表面试样和硬水的组合用于模拟镀锌冷却塔中通常存在的条件。在高pH硬水中，锌表面的氧化以白色粉末状薄膜为特征，这种薄膜被称为白锈。据报道，白锈由碳酸锌化合物组成。所选择的化学处理被用于一系列实验，以确定它们的使用是否可以防止或减少锌的氧化。本次调查中的锌腐蚀被确定为氧化锌，而主要不是碳酸锌。 实验包括将试样浸入处理过的水中，用处理过的水喷洒试样，并将在线试样置于相对较高的表面速度下，以模拟冷却塔环境。从实验结果来看，与未经处理的水相比，处理剂HEDP、钼酸盐和臭氧是至少抑制氧化锌形成的三种处理方法。使用钼酸盐处理时，试片质量损失相对较小，部分原因可能是与其他处理化学品（约10 ppm）相比，钼酸盐的浓度相对较高（约200 ppm）。在使用相同的储水槽对试样进行200小时有臭氧和100小时没有臭氧的试验时，臭氧处理往往会减少氧化锌的形成。 结论是，在缺乏镀锌冷却塔的详细钝化处理程序的情况下，添加或应用处理剂有可能显著减少（如果不能防止）高pH硬水中氧化锌的形成。为确定腐蚀所代表的化合物而进行的表面分析表明，氧化锌可能水合或具有碳氧键。单位:双引文:ASHRAE交易，第109卷，第。1.

An investigation was performed on the effect of various chemical treatments on the oxidation of zinc surfaces by high pH, hard water. The combination of zinc surface coupons and hard water was used to simulate the conditions as they typically exist in galvanized cooling towers. Oxidation on zinc surfaces in high pH hard water is characterized by a white powdery film, which has been referred to as white rust. White rust has been reported to consist of zinc carbonate compounds. The chemical treatments chosen were used in a range of experiments to determine if their use could prevent or minimize the oxidation of the zinc. The zinc corrosion in this investigation was identified as zinc oxide and not primarily zinc carbonates.The experiments included submerging coupons in treated water, spraying coupons with treated water, and subjecting in-line coupons to a relatively high surface velocity so as to simulate a cooling tower environment. From the experimental results, it appears that the treatment chemicals HEDP, molyb date, and ozone are three treatments that at least inhibit the formation of zinc oxide compared to untreated water. The relatively small coupon mass loss when using the molybdate treatment may have been due in part to its relatively large concentration (~200 ppm) compared to the other treatment chemicals (~10 ppm). In the test of the coupons for 200 hours with ozone and 100 hours without ozone, using the same water reservoir, the ozone treatment tended to minimize zinc oxide formation.It is concluded the addition or application of treatment chemicals has the potential to significantly reduce, if not prevent, the formation of zinc oxide in high pH hard water, in the absence of a detailed passivation treatment program for galvanized cooling towers. The surface analyses performed for determining the compounds represented by the corrosion indicated zinc oxide, possibly hydrated or with carbon-oxygen bonding.Units: Dual