EIS study on passive films of AISI 304 stainless steel in oxygenous sulfuric acid solution

2009 ◽  
Vol 41 (6) ◽  
pp. 531-539 ◽  
Author(s):  
Weiya Lai ◽  
Wenzhen Zhao ◽  
Feng Wang ◽  
Chengzhu Qi ◽  
Jun Zhang
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Passive Films ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304

scholarly journals An Electrochemical Impedance Spectroscopic Study of the Passive State on AISI 304 Stainless Steel

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
A. Fattah-alhosseini ◽  
S. Taheri Shoja ◽  
B. Heydari Zebardast ◽  
P. Mohamadian Samim
Keyword(s):  
Stainless Steel ◽  
Acid Solution ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Transport Processes ◽  
Passive Films ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Interfacial Impedance

The passivity and protective nature of the passive films are essentially related to ionic and electronic transport processes, which are controlled by the optical and electronic properties of passive films. In this study, the electrochemical behavior of passive films anodically formed on AISI 304 stainless steel in sulfuric acid solution has been examined using electrochemical impedance spectroscopy. AISI 304 in sulphuric acid solution is characterized by high interfacial impedance, thereby illustrating its high corrosion resistance. Results showed that the interfacial impedance and the polarization resistance () initially increase with applied potential, within the low potential passive. However, at a sufficiently high potential passive ( V), the interfacial impedance and the polarization resistance decrease with increasing potential. An electrical equivalent circuit based on the impedance analysis, which describes the behavior of the passive film on stainless steel more satisfactorily than the proposed models, is presented.

Pt-Based Catalytic Microcombustor for Micropower Generation

2014 ◽  
Vol 699 ◽  
pp. 635-641
Author(s):  
Nazri Murat Muhamad ◽  
Azman Miskam Muhamad ◽  
Ahmad Mohd Azmier ◽  
Zainal Alimuddin Zainal Alauddin ◽  
Zulfikar Ishak Mohammad
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Steel Surface ◽  
Treatment Time ◽  
Platinum Catalyst ◽  
304 Stainless Steel ◽  
Stainless Steel Surface ◽  
Impregnation Method

This paper presents the fabrication and characterization of platinum-based catalytic microcombustor. The platinum catalyst was deposited onto type-304 stainless steel using the wet impregnation method. The stainless steel undergoes controlled conversion coating treatment in sulfuric acid solution to increase the porosity of its surface before the deposition of the platinum catalyst. The scanning electron microscopy result showed that the porosity on the stainless steel surface will depend on the length of treatment time in the sulfuric acid solution. The surface porosity increased as the treatment time increases. The stainless steel surface morphology changed from smooth to ‘cracked-mud’ morphology after treatment in sulfuric acid solution. The treatment time also provide significant effect to the amount of platinum deposited on the stainless steel surface. The energy dispersive x-ray analysis showed that the amount of deposited platinum for 10 seconds of treatment time was 0.68 wt%, whereas those for 20 and 30 seconds were 0.87 wt% and 1.10 wt%, respectively. Liquefied petroleum gas-air combustion result showed that the flame completely submerged inside the microcombustor with a catalyst, whereas portions of flame can be observed at the exhaust for the microcombustor without a catalyst. The minimum air-to-fuel ratios before the combustion blow-out for 10, 20, and 30 seconds of treatment time was 0.5, 0.4, and 0.3 respectively.

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