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采用电化学测试和浸泡实验研究了喷射成形H13钢与铸造H13钢的耐腐蚀性能,通过OM、SEM和TEM分析了材料组织对耐蚀性的影响以及腐蚀机理。结果表明:喷射成形H13钢在1050℃淬火后600℃回火时自腐蚀电位最高,耐腐蚀性能最好;喷射成形H13钢的点腐蚀由夹杂物引起,点腐蚀产物在夹杂物周围沉积,造成溶液局部p H下降,加速了腐蚀过程;与铸造H13钢相比,由于喷射成形H13钢组织中存在孔洞,晶界、位错密度大,容易成为点蚀的诱发源,回火后在晶界和马氏体边界析出的大量碳化物造成基体贫Cr,增加了阴阳极的电位差,导致喷射成形H13钢的耐蚀性与铸造H13钢相比稍差。
The corrosion resistance of spray-formed H13 steel and cast H13 steel was studied by electrochemical test and immersion test. The influence of material microstructure on corrosion resistance and corrosion mechanism were analyzed by OM, SEM and TEM. The results show that the corrosion resistance of spray-formed H13 steel after tempering at 600 ℃ is the highest and the corrosion resistance is the best. The pitting corrosion of spray-formed H13 steel is caused by inclusions and the pitting corrosion products are deposited around the inclusions, resulting in Compared with the cast H13 steel, H13 steel possesses large holes, grain boundaries and dislocation density in the spray-formed H13 steel, which easily leads to pitting corrosion. Compared with the cast H13 steel, And a large amount of carbides precipitated on the martensite boundary result in a Cr depletion of the matrix and an increase in the potential difference between the anode and the cathode, resulting in a slightly worse corrosion resistance of the spray-formed H13 steel than that of the cast H13 steel.