Characterization and Corrosion Resistance of Anodic Electrodeposited Titanium Oxide/Phosphate Films on Ti-20Nb-10Zr-5Ta Bioalloy

Popa, Mónica; Vasilescu, Cora; Drob, Silviu Iulian; Osiceanu, Petre; Anastasescu, Mihai; Calderón-Moreno, José Maria

doi:10.5935/0103-5053.20130146

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“…The material shows a better localized corrosion resistance when the hysteresis loop has a larger offset [23]. On the contrary, if the hysteresis loop is electronegative, the larger the offset, the worse the localized corrosion resistance of the material is [93,94].…”

Section: Cyclic Polarizationmentioning

confidence: 99%

Electrochemical Study of Corrosion Behavior of Stellite 6 Alloy and 17-4PH Stainless Steel in Amine Solutions

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Stellite 6 alloy has been popularly employed as the material for the seat face of various control valves due to its excellent combined mechanical, corrosion, wear, and high temperature properties. However, a suggestion was made in an article that Stellite 6 alloy should be avoided in the amine containing feed water service of power plants, and Stellite 6 alloy should be replaced by stainless steels, such as 17-4PH stainless steel. To provide the power generation industry with scientific evidence, the corrosion behavior of Stellite 6 alloy and 17-4PH stainless steel is studied in morpholine solution, cyclohexylamine solution and sodium hydroxide solution at the same pH around 9.5 using electrochemical test methods such as potentiodynamic polarization, cyclic polarization, and electrochemical impedance spectroscopy (EIS) in this research. The microstructures of the tested materials and corroded surfaces are analyzed using scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) spectroscopy. The experimental results show that Stellite 6 alloy and 17-4PH stainless steel are generally resistant to corrosion in amine solutions by forming a Cr-rich oxide films on their surfaces, but they can be corroded when the oxide film is broken, leading to damage of the surfaces and the removal of the materials.The oxide film of 17-4PH stainless steel is more resistant to electron transferring than that of Stellite 6 alloy, thus has better resistance to corrosion. However, the oxide film of 17-4PH stainless steel has less durability and it works well only within a certain potential range. Otherwise, Stellite 6 alloy has better overall corrosion and pitting corrosion resistance than 17-4PH stainless steel in amine environments.iii

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Section: Cyclic Polarizationmentioning

confidence: 99%

Electrochemical Study of Corrosion Behavior of Stellite 6 Alloy and 17-4PH Stainless Steel in Amine Solutions

Li¹

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show abstract

Characterization and Corrosion Resistance of Anodic Electrodeposited Titanium Oxide/Phosphate Films on Ti-20Nb-10Zr-5Ta Bioalloy

Cited by 1 publication

References 0 publications

Electrochemical Study of Corrosion Behavior of Stellite 6 Alloy and 17-4PH Stainless Steel in Amine Solutions

Electrochemical Study of Corrosion Behavior of Stellite 6 Alloy and 17-4PH Stainless Steel in Amine Solutions

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