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材料的静电位以及接触电偶的混合电位和电流对于评定材料组合的接触腐蚀危险性很有意义。为此研制了一种具有6个测量位置的试验台,在该试验台上可以同时自动地测得材料组合/溶液/溶液条件/温度这四个因素的六种配合时的腐蚀参数。每个测量位置备有两个电解槽。当在一个槽里测量两种材料试样的静电位时,可在另一个槽里用一个短路的完全相同的试样对测量接触电偶的混合电位和电流。测量值由一个可编制程序的测量点扫描器依次接受并记录。在碱性和酸性还原溶液中,由低合金结构钢、18/9CrNiTi钢、72/20NiCrFe合金和含O.5％Ti及O.1％Zr的钼合金进行材料组合时,低合金钢电位最近,而钼合金电位最高。若把测量值绘在极化曲线图中,则可获得不同系统中可能产生的接触腐蚀的概况以及腐蚀机理方面的线索。
The static potential of the material as well as the mixed potential and current of the galvanic couple make a lot of sense for assessing the contact corrosion risk of the material combination. For this purpose, a test rig with six measuring positions was developed, on which the corrosion parameters of the six combinations of material combinations / solution / solution conditions / temperature were automatically measured at the same time. Two cells per measuring position. When measuring the static potentials of two material samples in one cell, the potential and current of the galvanic couple may be measured in the other cell using a short, identical sample pair. The measured values are received and recorded in order by a programmable measuring point scanner. In both alkaline and acidic reduction solutions, the combination of the materials from low-alloy structural steels, 18/9 CrNiTi steels, 72/20 NiCrFe alloys, and molybdenum alloys containing 0.5% Ti and 0.1% Zr, , While the highest potential of molybdenum alloy. If the measured values are plotted on a polarization curve, an overview of possible contact corrosion in different systems and clues on the mechanism of corrosion can be obtained.