Effects of Heat Treatments in Corrosion Behavior of HVOF-Sprayed Ni-Based Alloy Coatings

2017 ◽  
pp. 53-62
Author(s):  
J. A. Cabral-Miramontes ◽  
R. Rocha Reséndez ◽  
C. Gaona Tiburcio ◽  
P. Zambrano-Robledo ◽  
C. Poblano Salas ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Heat Treatments

Effect of Heat Treatments on Stress Corrosion Behavior of 7050 Al Alloys in 3.5% NaCl Solution

2016 ◽  
Vol 877 ◽  
pp. 543-549
Author(s):  
Wei Wei Ren ◽  
Xing Feng Zhan ◽  
Lin Chi Zou ◽  
Qiang Li ◽  
Jun Feng Chen
Keyword(s):  
Corrosion Resistance ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Heat Treatments ◽  
Al Alloys ◽  
Slow Strain Rate ◽  
Nacl Solution ◽  
Stress Corrosion Resistance

Effect of heat treatments on the stress corrosion behavior of 7050 Al alloys in 3.5% NaCl solution has been investigated using slow strain rate tensile (SSRT) test. During the slow strain rate tensile process, electrochemical impedance spectroscopy (EIS) in real time was carried out to characterize the electrochemical behavior for different tempers 7050 Al alloys. The investigation shows that both the stress corrosion resistance of 7050 Al alloys is controlled by heat treatments due to the different precipitates state. The improvement of stress corrosion resistance is contributed to the tiny precipitates in matrix which are beneficial to corrosion potential and maintain passivation, and precipitates discontinuous distribution at grain boundary which obstruct intergranular crack connection. Moreover, base on the results, we find out retrogression and re-aging (RRA, i.e., T6 + 200 °C/ retrogression + water quench + T6) increases both tensile strength and stress corrosion resistance. The optimized of retrogression time is 30 minutes.

Surface Morphology and Corrosion Behavior of Electrolytic Coatings in Different Aqueous Solutions

2013 ◽  
Vol 594-595 ◽  
pp. 585-589
Author(s):  
Siti Hawa Mohamed Salleh ◽  
Mohd Nazree Derman ◽  
Mohd Zaidi Omar ◽  
Rohaya Abdul Malek
Keyword(s):  
Mechanical Properties ◽  
Surface Morphology ◽  
Aqueous Solutions ◽  
Corrosion Behavior ◽  
Stainless Steels ◽  
Surface Modifications ◽  
Heat Treatments ◽  
Martensitic Stainless Steels ◽  
Corrosion Rates ◽  
Corrosive Environments

SS440C steels show potential as highest mechanical properties compared to others martensitic stainless steels. As their properties can be altered by some particular heat treatments, this steel is suitable for a extensive ranges of applications such as bearings, gage blocks, races, valve parts and many other manufacturing important components. Unfortunately, bare SS440C substrates corrode too quickly under corrosive environments. Surface modifications that are able to reduce corrosion rates to suitable levels will allow SS440C to become a reality for much more applications [1-.

Heat treatments effects on functionalization and corrosion behavior of Ti-6Al-4V ELI alloy made by additive manufacturing

2018 ◽  
Vol 765 ◽  
pp. 961-968 ◽  
Author(s):  
Guilherme Arthur Longhitano ◽  
Maria Angeles Arenas ◽  
Ana Conde ◽  
Maria Aparecida Larosa ◽  
André Luiz Jardini ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Corrosion Behavior ◽  
Heat Treatments

scholarly journals Corrosion Initiation and Propagation on Carburized Martensitic Stainless Steel Surfaces Studied via Advanced Scanning Probe Microscopy

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 940 ◽  
Author(s):  
Armen Kvryan ◽  
Corey Efaw ◽  
Kari Higginbotham ◽  
Olivia Maryon ◽  
Paul Davis ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Scanning Probe Microscopy ◽  
Surface Hardness ◽  
Heat Treatments ◽  
Carbon Steels ◽  
Scanning Probe ◽  
Wear Testing ◽  
Probe Microscopy ◽  
Force Microscopy

Historically, high carbon steels have been used in mechanical applications because their high surface hardness contributes to excellent wear performance. However, in aggressive environments, current bearing steels exhibit insufficient corrosion resistance. Martensitic stainless steels are attractive for bearing applications due to their high corrosion resistance and ability to be surface hardened via carburizing heat treatments. Here three different carburizing heat treatments were applied to UNS S42670: a high-temperature temper (HTT), a low-temperature temper (LTT), and carbo-nitriding (CN). Magnetic force microscopy showed differences in magnetic domains between the matrix and carbides, while scanning Kelvin probe force microscopy (SKPFM) revealed a 90–200 mV Volta potential difference between the two phases. Corrosion progression was monitored on the nanoscale via SKPFM and in situ atomic force microscopy (AFM), revealing different corrosion modes among heat treatments that predicted bulk corrosion behavior in electrochemical testing. HTT outperforms LTT and CN in wear testing and thus is recommended for non-corrosive aerospace applications, whereas CN is recommended for corrosion-prone applications as it exhibits exceptional corrosion resistance. The results reported here support the use of scanning probe microscopy for predicting bulk corrosion behavior by measuring nanoscale surface differences in properties between carbides and the surrounding matrix.

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