Effect of tellurium on sulfide modification and corrosion resistance of 38MnVS non-tempered steel
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摘要: 开展三电极系统电化学试验，分析碲添加对非调质钢腐蚀性的影响，利用扫描电镜（SEM）和电子探针（EDS）对钢中硫化物进行表征分析，对电化学腐蚀试验结果进行诠释。结果表明：随着钢中碲含量的增加，钢的自腐蚀电位升高，腐蚀倾向减小；少量碲（0.026%）固溶在硫化锰中，钢的腐蚀电流最小，为5.13×10−6 A，耐蚀性能最好。钢中加入碲后，MnTe包裹在MnS周围，导致夹杂物长宽比明显减小，长条状硫化物转变为椭球状，分布更加均匀，有效降低了硫化物周围的应力集中。Abstract: A three-electrode electrochemical test was carried out to investigate the effect of tellurium addition on the corrosion of un-tempered steel, and the sulfide in steel was characterized by scanning electron microscopy (SEM) and electron probe (EDS), and the electrochemical corrosion test results were interpreted. The results show that with the increase of tellurium content, the self-corrosion potential of steel increases and the corrosion tendency decreases. A small amount of tellurium (0.026%) is solid solution in manganese sulfide, and the steel achieve the lowest corrosion current of 5.13×10−6 A and the best corrosion resistance. With tellurium addition in steel, MnTe is surrounded by MnS, resulting in a significant reduction in the aspect ratio of inclusions and a more uniform distribution of long strips of sulfide into ellipsoids, which effectively reduces the stress concentration around the sulfide.
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Key words:
- non-tempered steel /
- tellurium modification /
- manganese sulfide /
- corrosion resistance
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图 4 不同碲含量的塔费尔曲线
Figure 4. Tafel curve of 38MnSV steels with different tellurium contents
图 5 不同碲含量非调质钢光学显微镜100倍照片
Figure 5. Optical microscope of 38MnSV steels with different tellurium contents
(a) 0；(b) 0.026%；(c) 0.05%；(d) 0.084%；(e) 0.16%
图 6 不同碲含量试样的硫化物
(a) 平均面积；(b)面积分布；(c)长宽比分布
Figure 6. Sulfides of samples with different tellurium content
图 7 不同碲含量钢中夹杂物SEM照片
Figure 7. SEM images of inclusions in steels with different tellurium contents
(a) (b) 0； (c)(d) 0.026%；(e) (f) 0.05%；(g) (h) 0.084；(i) (j) 0.16%
图 8 含碲0.16%钢中MnTe和MnS复合夹杂物的EDS照片
(a)双核MnS和MnTe复合夹杂物; (b)单核MnS和MnTe复合夹杂物
Figure 8. EDS images of MnTe-MnS composite inclusions in steel containing 0.16% tellurium
表 1 38MnSV化学成分
Table 1. Chemical composition of 38MnSV steel
% C Si Mn P S Al Als Ca Cr Mo V Ti Ni Cu 0.37 0.56 1.4 0.01 0.54 0.017 0.016 0.0004 0.17 0.01 0.13 0.012 0.03 0.01 
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表 2 39MnSV冶炼钢锭中碲含量
Table 2. Tellurium content in smelted ingot of 39MnSV
试样编号 碲含量/% Te/S 1 0 0 2 0.026 0.50 3 0.050 0.96 4 0.084 1.62 5 0.160 3.08
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表 3 不同碲含量试样的自腐蚀电位和腐蚀电流
Table 3. Self-corrosion potential and corrosion current of samples with different tellurium contents
碲含量/% 自腐蚀电位/V log( j/A·cm−2) j/（A·cm−2） icorr/A 0 −0.67 −5.01 9.77×10−6 9.77×10−6 0.026 −0.67 −5.29 5.13×10−6 5.13×10−6 0.05 −0.65 −5.15 7.08×10−6 7.08×10−6 0.084 −0.53 −4.67 2.14×10−5 2.14×10−5 0.16 −0.58 −4.59 2.57×10−5 2.57×10−5
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