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利用腐蚀电化学法及化学浸泡法研究了10NiCrMo钢在人工海水及3.5%NaCl溶液中的腐蚀行为。结果表明:10NiCrMo钢在人工海水中的自然腐蚀电位为-0.690 V,在3.5%NaCl溶液中为-0.661 V,在人工海水中腐蚀电位较在3.5%NaCl溶液中低;3个月室内全、间浸腐蚀中,腐蚀速率大小主要受氧扩散控制影响,随着腐蚀时间增长,表面锈层的增厚,10NiCrMo钢在人工海水及3.5%NaCl溶液中的全、间浸腐蚀速率随时间的延长而降低,1 500 h后趋向稳定;10NiCrMo钢在人工海水中全、间浸腐蚀速率分别为0.338~0.459 mm/a和0.279~0.435 mm/a,在3.5%NaCl溶液中全、间浸平均腐蚀速率分别为1.200~1.141 mm/a和0.840~0.404 mm/a,虽在人工海水中腐蚀电位较在3.5%NaCl溶液中低,但在人工海水中全、间浸腐蚀速率均比对应时间段内在3.5%NaCl溶液中小,在人工海水中及3.5%NaCl溶液中的间浸腐蚀速率比全浸低。
The corrosion behavior of 10NiCrMo steel in artificial seawater and 3.5% NaCl solution was studied by means of electrochemical corrosion and chemical immersion. The results showed that the natural corrosion potential of 10NiCrMo steel was -0.690 V in artificial seawater and -0.661 V in 3.5% NaCl solution. The corrosion potential of 10NiCrMo steel in artificial seawater was lower than that in 3.5% NaCl solution. The corrosion rate in intercritical corrosion was mainly affected by oxygen diffusion. With the increase of corrosion time, the thickening of the surface rust layer, the corrosion rate of 10NiCrMo steel in all seawater and 3.5% NaCl solution was increased with time While the corrosion rate of 10NiCrMo steel in artificial seawater was 0.338-0.459 mm / a and 0.279-0.435 mm / a, respectively. The average corrosion rate of 10NiCrMo steel in 3.5% NaCl solution was averagely Although the corrosion potential in artificial seawater was lower than that in 3.5% NaCl solution, the corrosion rates in all artificial and artificial seawater were all higher than those in the corresponding period 3.5% NaCl solution was small, in artificial seawater and 3.5% NaCl solution immersion corrosion rate lower than the full dip.