Abstract: In order to study the impact of water compositions to scale formation, based on experience, we choose four factors (HCO3, Hardness, P, Ca/Mg) that are discrepant but all have an influence on the formation of scale, and then through orthogonal test, we study the impact situation of the factors to scale formation, and through scanning electron microscope and ion chromatograph analyzer, we analysis the morphology and precipitation amount of the scale. The result is that four factors sorted by effect size from big to small: HCO3>Hardness>P>Ca/Mg, and meanwhile HCO3, Hardness and Ca/Mg have promoting effect on scale, P ion has inhibiting effect on scale. Rely on further analysis with scale morphology, we find P ion can reduce the formation and growth of scale crystal nucleus, drop scale precipitation amount and therefore has inhibiting effect on scale.

Key words: Electrochemistry, Ion in water environment, Precipitation amount, Morphology