The Relationship Between Surface Roughness and Corrosion

Toloei, Alisina; Stoilov, Vesselin; Northwood, Derek O.

doi:10.1115/imece2013-65498

Cited by 70 publications

(37 citation statements)

References 32 publications

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“…The results are in good agreement with SEM and potentiodynamic polarization tests. In the case of metals such as aluminum and nickel, the lower corrosion rate was related to the formation of a stable passive film on smoother surfaces as suggested by the authors [3,[12][13][14][15] but in the case of mild steel no stable passive film is formed and rougher surfaces showed less corrosion and lower oxygen content. Generally, more increase in the oxygen content was observed for mild steel indicating more oxides forms on the surface.…”

Section: Eds Analysismentioning

confidence: 86%

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Toloei

Stoilov

Northwood

2015

Materials Characterisation VII

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Unidirectional surface roughness of varying magnitudes were created on both nickel and mild steel by grinding on SiC papers with grit sizes from G60 (roughest) to G1200 (smoothest) and the corrosion resistance in 0.5M H 2 SO 4 solution was determined using a potentiodynamic polarization technique. A different trend of corrosion rate versus roughness was seen for the active-passive metal (nickel) and non-active-passive metal (mild steel). For nickel there was an increase in corrosion rate with increasing roughness, whereas for mild steel the corrosion rate decreased with increasing surface roughness. Furthermore, through a detailed examination of the surface before and after corrosion using techniques including profilometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), it was established that different corrosion mechanisms were operative for nickel and mild steel. For both metals, the smaller grit sizes produced a rougher surface with wider and deeper grooves. In the case of nickel, the higher roughness provided a greater contact area between the corrosive medium and metal and there was trapping of the corrosive ions in the deep grooves. Both of these factors would lead to an increase in corrosion rate. Also, for the smoother nickel surfaces, it is easier to form a stable passive film. For mild steel, which does not form a passive film, corrosion rates are generally much higher than for nickel. For the rougher surfaces with the deeper grooves, the corrosion product, FeSO4, can fill the grooves thereby acting as a barrier to further ingress of the corrosive ions to the un-corroded metal.

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Section: Eds Analysismentioning

confidence: 86%

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Toloei

Stoilov

Northwood

2015

Materials Characterisation VII

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“…Rougher surfaces with deeper groves have lower openness (ratio of width to depth at opening of the grooves) which limit the diffusion of the corrosive ions out of the formed grooves, hence have a higher possibility to grow larger. On smooth surfaces however the formation of stable passive film is more possible to occur which will result in less corrosion [15]. In our case, coatings with nickel chloride concentration lower than 0.25M proved to have positive skewness, expected to have superior corrosion resistance than others.…”

Section: Resultsmentioning

confidence: 56%

Influence of Bath Composition on the Structure and Properties of Nickel Coatings Produced by Electrodeposition Technique

Birlik¹,

Azem²

2018

deufmd

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Electrodeposited nickel coatings are extensively used in engineering applications due to their excellent corrosion and wear resistance and easy mechanical operation. The structural characteristics, corrosion and mechanical properties of nickel coatings are related to the deposition parameters; such as bath component, composition, current density, pH, deposition time and additives. Electrodeposition technique is one of the most technologically feasible and economical techniques for producing metallic coatings. Watts bath is the most commonly applied nickel electrodeposition bath. Aim of this study is to optimize Watts bath composition by changing nickel chloride concentration and to investigate structural, morphological, corrosion and mechanical properties of produced coatings. It was found that coatings prepared with 0.17M nickel chloride concentration in Watts bath present the better corrosion resistance and mechanical property.

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“…This behavior could be related to the roughness of the surface. Toloei et al [30] reported that high surface roughness usually accelerated the corrosion rate due to the less tendency of surface to create a complete passive layer. Totally, the lowest corrosion rate corresponded to the Ni-P-10M-20S coating.…”

Section: Electrochemical Test Resultsmentioning

confidence: 99%

Electrochemical Characteristics of Various Ni-P Composite Coatings in 0.6M NaCl Solution

Azadi¹,

Tavakolli²,

Haghighatkhah³

et al. 2020

Preprint

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In this paper, various Ni-P composite coatings containing toner, MoS2, and nano-SiO2 particles were deposited on steel substrates by the electroless method. Then, the electrochemical properties of these coatings after a heat treatment process were compared. The microstructural evaluations were also done by using the optical and electron microscopy methods. Both Tafel polarization and electrochemical impedance spectroscopy techniques were utilized to survey the electrochemical behavior of such coatings. The surface morphology of all coatings contained cauliflower-like nodules. The X-ray diffraction patterns showed the crystalline phases of Ni and Ni3P for all coatings after the heat-treatment step. Obtained results showed that all composite coatings exhibited lower corrosion rates with respect to Ni-P coatings. Such a reduction was about 21.6-92.2%. This behavior was attributed to the presence of reinforcement as barriers for corrosive ion diffusion through the coating plus the changes in detected phases and thickness. Electrochemical impedance spectroscopy test results also demonstrated that the increase in the polarization resistance for composites coatings was about 18.4-85.3% after 1 h immersion in a 0.6M NaCl solution; however, when the immersion time increased to 24 h, such increased resistance changed to 18.1 to 73.1%. Totally, despite the lower deposition rate, the presence of MoS2 and nano-SiO2 particles were more effective than toner particles to raise the corrosion rate of the Ni-P coating.

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The Relationship Between Surface Roughness and Corrosion

Cited by 70 publications

References 32 publications

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Influence of Bath Composition on the Structure and Properties of Nickel Coatings Produced by Electrodeposition Technique

Electrochemical Characteristics of Various Ni-P Composite Coatings in 0.6M NaCl Solution

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