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本文研究了共晶碳化物数量在20—25％范围内,含铬量由2—24％,铸态及热处理态的铬系白口铸铁在不同介质条件下的腐蚀磨损特性.研究结果表明:在强酸性介质中,腐蚀是导致腐蚀磨损失重量增大的主要因素,含铬量较高的奥氏体有较好的腐蚀磨损抗力,碳化物存在没有任何益处;在弱酸性介质中,腐蚀与磨损共同对腐蚀磨损失重量起作用,提高基体含铬量,保持适当数量碳化物将有效地提高其腐蚀磨损抗力;在中性及碱性介质中,磨损是主要影响因素,提高基体硬度有助于腐蚀磨损抗力的提高.合金元素铜可降低基体腐蚀速度,促进基体钝化,且有利于腐蚀磨损抗力的改善.本文研究结果为杂质泵过流部件的选材提供了依据.
In this paper, the eutectic carbides in the range of 20-25%, the content of chromium from 2-24%, the as-cast and heat treated chromium white cast iron in different media conditions corrosion wear characteristics of the results show that: In strong acid medium, corrosion is the main factor leading to the increase of loss weight of corrosion wear. The austenite with higher chromium content has better corrosion and wear resistance, and there is no benefit of carbides. In weak acid medium, corrosion Together with the wear and tear on the corrosive wear and tear loss of weight to play to improve the matrix chromium content to maintain the appropriate amount of carbide will effectively improve its corrosion resistance; in neutral and alkaline media, wear is the main factor to improve the substrate hardness Which helps to improve the corrosion resistance.Alloy element copper can reduce the matrix corrosion rate and promote the matrix passivation, and is conducive to the improvement of corrosion resistance.Finally, the results of this paper provide the basis for the selection of the overcurrent components of impurity pumps.