100℃除盐水中pH值和溶解氧含量对碳钢的腐蚀影响研究

Research on the Effect of the pH Value and the Content of Dissolved Oxygen on the Corrosion of Carbon Steel in the Deionized Water at 100℃

摘要: 采用失重法研究了100℃除盐水中pH值和溶解氧含量对20号碳钢的腐蚀影响。研究结果表明，在试验的氧含量和pH值范围内，在不除氧的100℃除盐水中提高pH值有利于减轻20号碳钢的腐蚀；在部分除氧或几乎彻底除氧的100℃除盐水中pH值调得不够高(如8.0~8.5)时腐蚀反而加重，pH值必须调得足够高(如9.0~9.5)腐蚀才会减轻；在各pH值除盐水中减少氧含量都有利于减轻20号碳钢的腐蚀。

Abstract: The effect of the pH value and the content of dissolved oxygen on the corrosion of 20# carbon steel in the deionized water at 100˚C are studied by the weight-loss method. According to the test results, when the oxygen content is very high in the deionized water without deoxidization at 100˚C, the increase of the pH value is helpful to reduce the corrosion of 20# carbon steel. In the deionized water slightly deoxidized or thoroughly deoxidized at 100˚C, if the pH value is not high enough (e.g. 8.0 - 8.5), the corrosion of 20# carbon steel will be more serious, and only when the pH value is high enough (e.g. 9.0 - 9.5) can the corrosion of 20# carbon steel be reduced. Besides, within the oxygen content and the pH value range tested, the decrease of the oxygen content is helpful to reduce the corrosion of 20# carbon steel under the same pH value.