Study on corrosion property of laser surface alloyed Cr-CrB2 layers on stainless steel
-
摘要: 为了提高SUS 304不锈钢表面的耐磨损、耐腐蚀性能，采用激光表面合金化的方法制备了Cr-CrB2层，并进行了理论分析和实验验证，取得了合金化层的组织和物相以及电化学腐蚀性数据。结果表明，合金化层组织致密、晶粒细小，与基体形成冶金结合，合金化层由奥氏体、马氏体、铁铬固溶体、碳化物和铬硼化合物组成；合金化层的耐蚀性得到提高，腐蚀速率降低，合金化层的极化曲线具有较长的活化-钝化区间；不锈钢基体发生严重的晶界腐蚀和点蚀，晶界腐蚀以孪晶晶界腐蚀为主，合金化层表面发生晶粒间的晶界腐蚀，伴有晶粒和晶界处的点蚀现象，点蚀坑明显小于基体表面的点蚀坑。这一结果对提高SUS 304不锈钢表面的耐磨损、耐腐蚀性是有帮助的。
-
关键词:
- 激光技术 /
- 腐蚀 /
- 激光表面合金化 /
- SUS 304不锈钢 /
- Cr-CrB2
Abstract: In order to improve the wear and corrosion resistance of SUS 304 stainless steel, an alloyed layer of Cr-CrB2 was fabricated on SUS 304 stainless steel using laser surface alloying. The datum about microstructure, phases and the corrosion property of the alloyed layer were obtained. Dense and homogeneous structure and fine grains were observed in the alloyed layer. A metallurgical bonding interface was formed between the alloyed layer and the substrate. The alloyed layer consists of austenite, martensite, Fe-Cr, chromium carbide and chromium boride. The alloyed layer shows higher corrosion resistance and lower corrosion rate than the substrate. The polarization curve of the alloyed layer has a long activaton-passivation segment. Intergranular corrosion and pitting in the grains and the grain boundaries are observed for substrate, and intergranular corrosion occurs mainly in the boundary. The alloyed layer shows intergranular corrosion in combination with pitting in the grains and grain boundaries. The size of the pitting in the substrate is larger than that in the alloyed layer. The results have a great help on the improvement of the wear and corrosion resistance of SUS 304 stainless steel.-
Keywords:
- laser technique /
- corrosion /
- laser surface alloying /
- SUS 304 stainless steel /
- Cr-CrB2
-
-
[1] LI P, SUN G F, ZHANG W, et al. The failure and enhancing techniques for blade of high-speed mixing machine[J].Pastics,2011,40(6):61-64 (in Chinese).
[2] HU X M, ZHANG W. Discussion for the problems in the structure design of plastics mixer[J]. Engineering Plastics Application, 2001, 29(2): 32-35 (in Chinese).
[3] MAJUMDAR J D, CHANDRA B R, MANNA I. Laser composite surfacing of AISI 304 stainless steel with titanium boride for improved wear resistance[J]. Tribology International, 2007, 40(1): 146-152.
[4] TIAN Y Sh, CHEN Ch Zh, WANG D Y, et al. Analysis of the growth mechanism of TiC crystal and the mechanical properties of the laser alloyed layer on the surface of pure titanium[J]. Laser Technology, 2005, 29(2): 113-115(in Chinese).
[5] SUN G F, ZHOU R, LI P, et al. Laser surface alloying of C-B-W-Cr powders on nodular cast iron rolls[J]. Surface and Coatings Technology, 2011, 205(8/9): 2747-2754.
[6] HAN T, WANG A H, PENG J, et al. Submicron MC-type reinforced coating produced by laser alloying[J]. Laser Technology, 2012, 36(4): 441-444 (in Chinese).
[7] ANANDAN S, PITYANA S, DUTTA M J. Structure-property-correlation in laser surface alloyed AISI 304 stainless steel with WC+ Ni+NiCr[J]. Materials Science and Engineering,2012,A536(11):159-169.
[8] NATH S, PITYANA S, DUTTA M J. Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance[J]. Surface and Coatings Technology, 2012, 206(15): 3333-3341.
[9] ZHONG M L, LIU W J, ZHANG H J. Corrosion and wear resistance characteristics of NiCr coating by laser alloying with powder feeding on grey iron liner[J]. Wear, 2006, 260(11/12): 1349-1355.
[10] HEYDARZADEH S M, EBRAHIMI M, GHASEMI H M, et al. Microstructural study of surface melted and chromium surface alloyed ductile iron[J]. Applied Surface Science, 2012, 258(19): 7348-7353.
[11] SHAN J G, REN J L, DING J Ch, et al. Microstructure and wear resistance of Cr powder alloying layers on cast iron[J]. Laser Technology, 2004, 28(1): 1-4 (in Chinese).
[12] JORDAN L R, BETTS A J, DAHM K L, et al. Corrosion and passivation mechanism of chromium diboride coatings on stainless steel[J]. Corrosion Science, 2005, 47(5): 1085-1096.
[13] KIRYUKHANTSEV-KORNEEV P V, PIERSON J F, PETRZHIK M I, et al. Effect of nitrogen partial pressure on the structure, physical and mechanical properties of CrB2 and Cr-B-N films[J]. Thin Solid Films, 2009, 517(8): 2675-2680.
[14] LI G, LIU L, HOU J Y, et al. Study on microstructure and performance of laser cladding Ni-Zr-Nb-Al amorphous composite coating[J]. Laser Technology, 2011, 35(2): 185-188 (in Chinese).
[15] COSTA L, LANSFORD K, RAJPUT D, et al. Unique corrosion and wear resistant identification tags via LISITM laser marking[J]. Surface & Coating Technology, 2009, 203(14): 1984-1990.
[16] RAJPUT D, LANSFORD K, COSTA L, et al. Molybdenum-on-chromium dual coating on steel[J]. Surface and Coatings Technology, 2009, 203(9): 1281-1287.
[17] YUE T M, YU J K, MAN H C. The effect of excimer laser surface treatment on pitting corrosion resistance of 316LS stainless steel[J]. Surface and Coatings Technology, 2001, 137(1): 65-71.
[18] NIU Sh R. The research of electrochemical corossion resistance of stalnless steels[D].Lanzhou:Lanzhou University of Technology, 2010: 31-32 (in Chinese).
[19] LLEWEUYN D T, HUDD R C. Steels:metallurgy and applications[M]. Oxford,UK: Reed Educational and Professional Publishing Ltd.,1998:321.
[20] DONG H L.The effect of deformation on microstructure and properties of 304 austenitic stainless steel[D]. Nanjing: Nanjing University of Seienee & Technology, 2010: 28-29 (in Chinese).
计量
- 文章访问数: 5
- HTML全文浏览量: 0
- PDF下载量: 8
下载: