This article gave the measuring principle, formula and method of waters expansion coefficient by using density value of pure water in different temperature.

利用不同温度下纯水的密度值，给出了水的体胀系数的计量原理、公式和方法。

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The results showed that the temperature, average current density, frequency, reverse pulse coefficient and duty cycle had great impact on the microstructure of coatings.

结果表明，温度、平均电流密度、频率、逆向脉冲系数及占空比对镀层性能和微观形貌有较大影响。

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