夹杂物对易切削钢曲轴耐酸蚀性能的影响
Effect of Inclusions on Acid Corrosion Resistance of Free-cutting Steel Crankshaft
摘 要
使用金相显微镜、扫描电镜、能谱分析仪等研究了MnS夹杂物对感应淬火易切削钢曲轴表面耐酸蚀性能的影响。结果表明：在10%（体积分数）硝酸水溶液中，裸露在曲轴表面的MnS夹杂物可促使MnS夹杂物/金属基体界面作为形核质点诱发点蚀，MnS夹杂物阳极氧化反应产物促使其附近微区内进一步发生强烈的氧化腐蚀，以腐蚀坑的形式破坏曲轴基体表面完整性。数据统计分析表明腐蚀坑最大宽度集中在30~55 μm，最大深度度集中在10~25 μm。
曲轴
易切削钢
点腐蚀
inclusion
crankshaft
free-cutting steel
pitting
Abstract
The effect of MnS inclusions on the acid corrosion resistance of an induction-hardened free-cutting steel crankshaft was investigated by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the MnS inclusions exposed on the crankshaft surface could introduce the pitting corrosion in microscale initially at the interfaces of MnS inclusion/metal matrix, which acted as nucleation sites of pitting corrosion in the medium of 10% nitric acid in water. The products of MnS anodic oxidation could accelerate further oxidative corrosion strongly in a surrounding micro zone and cause permanent damages in the form of corrosion pits to the crankshaft subsurface. The statistical analysis shows that the maximum width of the corrosion pits was concentrated at 30-55 μm, and the maximum depth at 10-25 μm.
中图分类号 TG178 DOI 10.11973/fsyfh-202107006
所属栏目 试验研究
基金项目
收稿日期 2020/4/18
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引用该论文: KONG Dequn,LAI Zhenhua,DONG Xiaomeng,ZHOU Jian,JIN Xiaoxu. Effect of Inclusions on Acid Corrosion Resistance of Free-cutting Steel Crankshaft[J]. Corrosion & Protection, 2021, 42(7): 30
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参考文献
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【2】CLAYTON D B,BROWN J R. Sulfides in free-machining steel[J]. Iron and Steel,1969,42(4):219.
【3】TURKDOGAN E T. Discussion of "sulfide inclusions in steel"[J]. Metallurgical Transactions B,1975,6(4):663-664.
【4】PARK J Y,PARK J K,CHOO W Y. Effect of Ti addition on the potency of MnS for ferrite nucleation in C-Mn-V steels[J]. ISIJ International,2000,40(12):1253-1259.
【5】ZHANG X F,LU W J,QIN R S. Morphology and distribution control of MnS inclusions in molten steel by electropulsing[J]. Materials Research Innovations,2014,18(Sup 4):244-248.
【6】OIKAWA K,OHTANI H,ISHIDA K,et al. The control of the morphology of MnS inclusions in steel during solidification[J]. ISIJ International,1995,35(4):402-408.
【7】YAN J,LI T,SHANG Z,et al. Three-dimensional characterization of MnS inclusions in steel during rolling the process[J]. Materials Characterization,2019,158:109944.
【8】GNANAMUTHU D,KATTAMIS T Z,FLEMINGS M C,et al. Effect of homogenization on sulfide inclusions in ferrous alloys[J]. Metallurgical Transactions,1974,5(12):2557-2567.
【9】MCFARLAND W H,CRONN J T. Spheroidization of type Ⅱ manganese sulfides by heat treatment[J]. Metallurgical Transactions A,1981,12(5):915-917.
【10】SHAO X,WANG X,JIANG M,et al. Effect of heat treatment conditions on shape control of large-sized elongated MnS inclusions in resulfurized free-cutting steels[J]. ISIJ International,2011,51(12):1995-2001.
【11】SHAO X J,WANG X H,JI C X,et al. Morphology,size and distribution of MnS inclusions in non-quenched and tempered steel during heat treatment[J]. International Journal of Minerals,Metallurgy and Materials,2015,22(5):483-491.
【12】WANG F,GUO H,LIU W,et al. Control of MnS inclusions in high and low-sulfur steel by tellurium treatment[J]. Materials,2019,12(7):E1034.
【13】RADTKE D,SCHREIBER D. Relationship between sulphide formation and machinability in free-cutting steels[J]. Steel Times,London,1966,193(5118):246-259.
【14】SIDJANIN L,KOVAC P. Fracture mechanisms in chip formation processes[J]. Journal of Materials Science & Technology,1997,13(5):439-444.
【15】秦声,胡蒙,陈小刚,等. 不同金属夹杂物对曲轴钢加工过程中刀具磨损及表面完整性的影响[J]. 工具技术,2019,53(8):29-32.
【16】TORKKELI J,SAUKKONEN T,HÄNNINEN H. Effect of MnS inclusion dissolution on carbon steel stress corrosion cracking in fuel-grade ethanol[J]. Corrossion Science,2015,96:14-22.
【17】KUNIYA J,ANZAI H,MASAOKA I. Effect of MnS inclusions on stress corrosion cracking in low-alloy steels[J]. Corrosion,1992,48(5):419-425.
【18】YANG S,ZHAO M,FENG J,et al. Induced-pitting behaviors of MnS inclusions in Steel[J]. High Temperature Materials and Processes,2018,37(9/10):1007-1016.
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