Corrosion behavior of the new wear resistant steels Ti60 and ANM450 applied for middle plates of scraper conveyor
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摘要: 以刮板输送机中板用新型耐磨钢Ti60与ANM450为研究对象，分析了微观组织和相结构，采用全浸失重法、电化学测试法及XRD分析研究了2种耐磨钢在去离子水、腐蚀离子溶液、成垢离子溶液、模拟矿井水溶液4种水质中的腐蚀行为。结果表明，腐蚀程度排序均为腐蚀离子溶液＞模拟矿井水＞成垢离子溶液＞去离子水; 耐腐蚀性能Ti60＞Hardox450＞ANM450;腐蚀产物主要成分为Fe2O3、α -FeO(OH)和Fe (OH)3，说明腐蚀反应主要是铁在溶液中的溶解。Abstract: This paper looks into the microstructure and phase structure of the new wear-resistant steels Ti60 and ANM450 applied for middle plates of scraper conveyer.Their corrosion behaviors in deionized water, corrosion ion solution, scaling ion solution and simulated mine water were studied by weight loss method, electrochemical tests and XRD analysis.The results showed that the corrosion order was corrosion ion solution>simulated mine water>scaling ion solution>deionized water. The order of corrosion resistance was Ti60 > Hardox450 > ANM450.The corrosion products were Fe2O3、α -FeO(OH) and Fe (OH)3, which indicated that iron was dissolved during the corrosion process.
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Key words:
- new wear resistant steel /
- uniform corrosion /
- electrochemical corrosion
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图 3 试验钢在腐蚀溶液中的宏观腐蚀形貌
Figure 3. The macroscopic corrosion morphology of the tested steels in corrosion solution
图 4 试验钢在腐蚀溶液中的均匀腐蚀失重
Figure 4. Uniform corrosion weight loss of the tested steels in corrosion solutions
图 5 试验钢在模拟矿井水中腐蚀产物XRD图谱
Figure 5. XRD pattern of corrosion products of the tested steels in simulated mine water
图 6 试验钢在腐蚀溶液中的极化曲线
Figure 6. Polarization curves of the tested steels in corrosive solutions
表 1 试验钢的化学成分
Table 1. Chemical compositions of three tested steels
% 材料 C Ti Si Mn Ni Mo Cr S P Hardox450 0.23 0 0.50 1.60 0.25 0.25 1.20 0.010 0.025 0 Ti60 0.31 0.61 0.15 0.56 0.61 0.31 0.82 0.006 0.004 0 ANM450 0.30 0.49 1.09 3.02 1.50 0.27 0.14 0.001 0.009 5 
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表 2 4种腐蚀溶液的化学成分
Table 2. The chemical compositions of four kinds of corrosive solution
成分 NaCl/(mg·L-1) Na2SO4/(mg·L-1) Mg(OH)2/(mg·L-1) CaCO3/(mg·L-1) pH 去离子水 — — — — 7.0 腐蚀离子溶液 137.18 2 993.56 — — 7.0 成垢离子溶液 — — 38.45 422.18 7.8 模拟矿井水 137.18 2 993.56 38.45 422.18 7.8
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表 3 试验钢在腐蚀溶液中的腐蚀参数
Table 3. Corrosion parameters of the tested steels in corrosive solutions
腐蚀溶液 耐磨钢 Ecorr/V Rcorr/mmPY 去离子水 Hardox450 -0.299 3 0.054 7 Ti60 -0.274 0 0.042 2 ANM450 -0.376 6 0.062 2 腐蚀离子溶液 Hardox450 -0.440 1 2.684 5 Ti60 -0.417 4 0.709 2 ANM450 -0.497 9 2.889 3 成垢离子溶液 Hardox450 -0.405 7 0.270 8 Ti60 -0.305 4 0.036 4 ANM450 -0.435 3 0.249 8 模拟矿井水 Hardox450 -0.431 7 1.144 3 Ti60 -0.423 9 1.092 5 ANM450 -0.472 2 1.400 3
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