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The corrosion current density decreased constantly as corrosion and scaling proceeded. The method might be divided into three stages. During Stage I (0-20 days), the corrosion current intensity of reasonable NaOCl quantity experiments (1, 2 mg/L) had been more than those of high NaOCl dose experiments (5, 10 mg/L). The difference could be explained by various oxidation potentials, pH and CaCO3 deposition. During phase II (20-80 times), higher proportions of Fe3O4 in scal
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