Corrosion resistance of HVOF-sprayed coatings for hard chrome replacement

被引：103

作者：

Bolelli, Giovanni ^{[1
]}

Giovanardi, Roberto ^{[1
]}

Lusvarghi, Luca ^{[1
]}

Manfredini, Tiziano ^{[1
]}

机构：

[1] Univ Modena & Reggio Emilia, Dipartimento Ingn Mat & Ambiente, I-41100 Modena, MO, Italy

来源：

CORROSION SCIENCE | 2006年 / 48卷 / 11期

关键词：

pitting corrosion; polarization; metal matrix composites; SEM; acid corrosion;

D O I：

10.1016/j.corsci.2006.03.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

HVOF-sprayed coatings (WC-17Co, WC-10Co-4Cr, Co-28Mo-17Cr-3Si) and electrolytic hard chrome (EHC) coatings corrosion resistances have been compared through electrochemical polarization tests (0.1 N HCl, 0.1 N HNO3) and Corrodkote test. EHC coatings passivate in HNO3, but undergo pitting corrosion in HCl and in Corrodkote test too. HVOF coatings do not passivate, but possess more noble corrosion potentials. Both in HNO3 and HCl, they undergo more generalized corrosion, with similar i(corr); crevice corrosion along splat boundaries is sometimes detected after the HCl test. Their i(corr) in 0.1 N HCl solution is lower than in several of EHC coatings. No visible damage in the HVOF coatings has occurred after the Corrodkote test. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：3375 / 3397

页数：23

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