Environmental factors affecting the corrosion behavior of reinforcing steel. IV. Variation in the pitting corrosion current in relation to the concentration of the aggressive and the inhibitive anions

2010 ◽  
Vol 52 (5) ◽  
pp. 1675-1683 ◽  
Author(s):  
S.M. Abd El Haleem ◽  
S. Abd El Wanees ◽  
E.E. Abd El Aal ◽  
A. Diab
Keyword(s):  
Environmental Factors ◽  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Corrosion Current ◽  
Reinforcing Steel ◽  
Factors Affecting

scholarly journals Effect of Nitrite Inhibitor on the Macrocell Corrosion Behavior of Reinforcing Steel

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Zhonglu Cao ◽  
Makoto Hibino ◽  
Hiroki Goda
Keyword(s):  
Corrosion Behavior ◽  
Current Density ◽  
Polarization Resistance ◽  
Cement Mortar ◽  
Corrosion Current ◽  
Potential Difference ◽  
Reinforcing Steel ◽  
Macrocell Current ◽  
The Relationship ◽  
Macrocell Corrosion

The effect of nitrite ions on the macrocell corrosion behavior of reinforcing steel embedded in cement mortar was investigated by comparing and analyzing the macrocell corrosion current, macrocell polarization ratios, and slopes of anodic and cathodic steels. Based on the experimental results, the relationship between macrocell potential difference and macrocell current density was analyzed, and the mechanism of macrocell corrosion affected by nitrite ions was proposed. The results indicated that nitrite ions had significant impact on the macrocell polarization ratios of cathode and anode. The presence of nitrite could reduce the macrocell current by decreasing the macrocell potential difference and increasing the macrocell polarization resistance of the anode.

scholarly journals Pitting Corrosion Behavior and Surface Microstructure of Copper Strips When Rolled with Oil-in-Water Emulsions

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7911
Author(s):  
Xudong Yan ◽  
Jianlin Sun
Keyword(s):  
Corrosion Behavior ◽  
Pitting Corrosion ◽  
Surface Defects ◽  
Interactive Effect ◽  
Rolling Direction ◽  
Corrosion Current ◽  
Surface Microstructure ◽  
Oil In Water ◽  
Current Densities ◽  
Corrosion Pits

Copper strips experience severe corrosion when rolled with an oil-in-water (O/W) emulsions lubricant. The effects of rolling reduction on the pitting corrosion behavior and surface microstructure of Cu strips were studied in detail using electrochemical measurements and electron back scattered diffraction (EBSD) analysis. It was found that the corrosion current densities of the rolled Cu strips increased with accumulated reduction, which also lowered the pitting potentials and weakened their corrosion resistances. Therefore, the corrosive tendency of Cu strips under different rolling reductions (ε) followed the order of ε0% < ε20.7% < ε50.6% < ε77.3%. The Cu surface easily reacted with chlorine, sulfur, and carbon components from O/W emulsions to generate pitting corrosion. Under the interactive effect of pitting corrosion and stress corrosion, pits expanded along the rolling direction. The aggregation of anions in surface defects, such as dislocations, metastable pits, and microcracks, further accelerated the pitting corrosion of the surface.

Effects of Retrogression Treatment Process on the Mechanical Properties and Corrosion Behavior of the Graphene/7075 Aluminum Matrix Composite

2020 ◽  
Vol 993 ◽  
pp. 747-755
Author(s):  
Bing Hui Ren ◽  
Kang Wang ◽  
Ran Wang ◽  
Jin Feng Leng
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Behavior ◽  
Matrix Composite ◽  
Pitting Corrosion ◽  
Aluminum Matrix ◽  
Corrosion Current ◽  
Aluminum Matrix Composite ◽  
Pitting Potential ◽  
Time To Peak ◽  
Peak Aging

The influence of various retrogression and re-ageing (RRA) treatment processes on the hardness, electrical conductivity and corrosion behavior of graphene/7075 aluminum matrix composite were investigated. The results showed that the hardness decreased swiftly at the initial stage and short time to peak value as the retrogression temperature (170 °C, 180 °C, 190 °C, 200 °C) rises. In the RRA 180 °C/120 min process, the electrical conductivity and peak-aging Brinell hardness were 37.9%IACS, 192.8. This RRA treatment possessed excellent pitting corrosion resistance, and the corresponding pitting potential (Epit), the passivation potential (Epit-Ecorr), the pitting corrosion current density (Logicorr) were -0.756V, 0.558V, -1.836A/cm2, respectively. This enhance can attribute that the continuous η phase distributed along the grain boundary became intermittent and coarse in the retrogression stage.

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