摘要
选择Ni-Cu-P钢和碳钢各两种,在pH=10的3%(质量分数)NaCl溶液中进行极化实验,比较钢的点蚀诱发敏感性;在3%海盐水中进行间浸挂片实验,评价钢的点蚀扩展速率;利用扫描电镜(SEM)、电子探针(EPMA)、X射线衍射(XRD)分析钢中夹杂物、腐蚀形貌和锈层的特征。结果表明:Ni-Cu-P钢比碳钢表现出更弱的点蚀诱发敏感性和更小的点蚀扩展速率。较弱的脱氧可降低碳钢的耐点蚀性能,但对Ni-Cu-P钢不产生明显影响。锈层分析结果发现,Ni-Cu-P钢和碳钢内锈层的主要成分接近,但Ni-Cu-P钢的内锈层明显比碳钢致密。Ni-Cu-P钢中Ni和P能有效降低酸化蚀坑内钢基体的腐蚀速率;Cu则有助于致密锈层的形成。
Two Ni-Cu-P steels and carbon steels were selected.Their pitting susceptibility was compared by means of potentiodynamic polarization tests in 3%（mass fraction） NaCl solution.The pitting propagation rate was evaluated by indoor interval hanging plate tests in 3% sea salt solution.The composition of inclusions,corrosive feature and characteristics of rust layers were studied by scanning electro microscopy（SEM）,electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）.The results indicate that the Ni-Cu-P steels exhibit weaker pitting susceptibility and lower pit propagation rate than carbon steels.Under the same condition,weaker deoxidization degree helps to lower pitting corrosion resistance of carbon steels,but the resistance to pitting corrosion of Ni-Cu-P steels is hardly influenced by deoxidization.According to the results of analysis on rust layer,main composition of inner rust layers formed on Ni-Cu-P steels and carbon steels are uniform,however,the inner rust layer of Ni-Cu-P steels is obviously more compact than that of carbon steels.The alloying elements of Ni and P in Ni-Cu-P steels help to decrease the corrosion rate of matrix in acidic pits,while Cu tends to form the compact rust layer.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2010年第8期38-43,共6页
Journal of Materials Engineering
