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本文通过腐蚀失重、腐蚀电位、极化曲线法对000Cr25Mo1、00Cr20Ni25Mo5Cu、00Cr25Ni5Mo2N、0Cr18Ni12Mo2Ti和纯Ti、Ti-0.8Ni-0.3Mo在不同浓度的甲酸和乙酸组成的混合液中的耐蚀性能进行了研究。试验溶液在沸腾前通氩除氧,腐蚀介质分别为甲酸40％+乙酸40％+水20％;甲酸40％+乙酸25％+水35％;甲酸60％+乙酸20％+水20％;甲酸10％+乙酸70％+水20％。试验结果表明了Ti0.8Ni-0.3Mo具有极优良的耐蚀性能,在试验过程中几乎没有失重。000Cr25Mo1、00Cr20Ni25Mo5Cu及00Cr25Ni5Mo2N的腐蚀失重远较0Cr18Ni12Mo2Ti为小。为了探明Ti-0.8Ni-0.3Mo、00Cr20Ni25Mo5Cu、0Cr18Ni12MoTi及纯Ti在沸腾甲酸40％+乙酸40％+水20％溶液中的腐蚀行为,测定了它们的腐蚀电位和动电位阳极极化曲线。Ti-0.8Ni-0.3Mo处于自钝化状态,00Cr20Ni25Mo5Cu的阳极极化曲线的临界电流密度较0Cr18Ni12Mo2Ti小得多。纯Ti的腐蚀失重与溶液成份和表面膜密切相关,波动较大,在甲酸40％+乙酸40％+水20％溶液中,其腐蚀电位在有氧化膜时为0～+100mv,而除去氧化膜后降为—500mv～—650mv,正处于阳极极化曲线活化区。为了进一步查明Ti-0.8Ni-0.3Mo优异的耐蚀性能与表面的组织结构的关系,进行了X衍射分析,发现有微量的Ti2Ni相存在。本文尚对钛合金和不锈钢的偶
In this paper, the corrosion resistance of 000Cr25Mo1, 00Cr20Ni25Mo5Cu, 00Cr25Ni5Mo2N, 0Cr18Ni12Mo2Ti and pure Ti, Ti-0.8Ni-0.3Mo in the mixed solution of formic acid and acetic acid with different concentrations were investigated by corrosion weight loss, corrosion potential and polarization curves . The test solution was argon-deoxygenated before boiling. The corrosive media were 40% formic acid, 40% acetic acid and 20% water respectively. Formic acid 40% + acetic acid 25% + water 35%, formic acid 60%, acetic acid 20% Formic acid 10% + Acetic acid 70% + Water 20%. Test results show that Ti0.8Ni-0.3Mo has excellent corrosion resistance, almost no weight loss during the test. Corrosion loss of 000Cr25Mo1, 00Cr20Ni25Mo5Cu and 00Cr25Ni5Mo2N is much smaller than that of 0Cr18Ni12Mo2Ti. In order to investigate the corrosion behavior of Ti-0.8Ni-0.3Mo, 0Cr18Ni25Mo5Cu, 0Cr18Ni12MoTi and pure Ti in 40% acetic acid + 40% acetic acid and 20% water, their corrosion potentials and potentiodynamic polarization curves were measured. Ti-0.8Ni-0.3Mo in the self-passivation state, 00Cr20Ni25Mo5Cu anodic polarization curve of the critical current density is much smaller than 0Cr18Ni12Mo2Ti. The corrosion loss of pure Ti is closely related to the solution composition and the surface film. The corrosion potential of pure Ti is 0 ~ +100 mv in 40% formic acid + 40% acetic acid + 20% water, After the film is reduced to -500mv ~ -650mv, is in the anodic polarization curve activation zone. In order to further ascertain the relationship between the excellent corrosion resistance of Ti-0.8Ni-0.3Mo and the microstructure of the surface, X-ray diffraction analysis was carried out to find that a small amount of Ti2Ni phase existed. This article is still on titanium and stainless steel