Benchmarking of Zinc Coatings for Corrosion Protection: A Detailed Characterization of Corrosion and Electrochemical Properties of Zinc Coatings

Wijesinghe, Sudesh; Tan, Zixi

doi:10.14773/cst.2017.16.1.38

Cited by 6 publications

(7 citation statements)

References 19 publications

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“…Such an observation suggested that FeO 2 and lepidocrocite may be partially transformed to goethite with prolonged exposure time. CS was exposed at three different sites with different deposition of chloride in Singapore . Correlation between mass loss in g/m 2 and the monitored chloride deposition rate suggested that airborne salinity may not be the sole parameter affecting the corrosion behavior of steel.…”

Section: Introductionmentioning

confidence: 99%

Outdoor atmospheric corrosion of carbon steel and weathering steel exposed to the tropical‐coastal climate of Thailand

Pålsson

Wongpinkaew

Khamsuk

et al. 2019

Materials & Corrosion

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This study focuses on atmospheric corrosion of carbon steel and weathering steel exposed at two different locations with dissimilar meteorological parameters and airborne pollutants in Thailand. The samples are subjected to an outdoor atmosphere for up to 36 months at Rayong, close to the Gulf of Thailand, and Phangnga, near the Andaman Sea. Thickness loss (µm), corrosion rate (µm/year) together with corrosion product morphology and composition are systematically analyzed using X-ray diffraction and a scanning electron microscope. Corrosion resistance of the tested steels exposed at both locations is discussed based on the above-mentioned parameters and calculated corrosion kinetics. The results indicate that the total time of wetness, amount of rainfall and chloride deposition rate play an important role in corrosion behavior of the tested steels. Alloying elements, copper, chromium and nickel, are shown to improve corrosion resistance of the samples when exposed at the location with a higher chloride concentration. K E Y W O R D Satmospheric corrosion, carbon steel, corrosion rate, thickness loss, weathering steel

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Section: Introductionmentioning

confidence: 99%

Outdoor atmospheric corrosion of carbon steel and weathering steel exposed to the tropical‐coastal climate of Thailand

Pålsson

Wongpinkaew

Khamsuk

et al. 2019

Materials & Corrosion

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“…On the contrary, the outdoor atmospheric corrosion at three different sites in Singapore was reported to be in the range of C2 to C3 for unalloyed carbon steel and zinc [35]. The difference in the degree of corrosivity may be attributed to the lower relative humidity in the tunnel as well as a lack of direct exposure to the rain and sun.…”

Section: Resultsmentioning

confidence: 99%

“…The difference in the degree of corrosivity may be attributed to the lower relative humidity in the tunnel as well as a lack of direct exposure to the rain and sun. The values of time of wetness (TOW), which is defined as the amount of time when the relative humidity exceeds 80% and the temperature is higher than 0°C, were found to range between 4000 and 5000 h/year in the outdoor atmosphere [35]. On the other hand, there was hardly any record of relative humidity higher than 80% at the exposure sites.…”

Section: Resultsmentioning

confidence: 99%

Accelerated corrosion test and field test of steel and zinc coupons at buffer areas and cross passages in a mass rapid transit tunnel

Goh

Tan

Gan

et al. 2023

Corrosion Engineering, Science and Technology

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A study has been conducted to measure the distribution of temperature, relative humidity and corrosivity due to uniform corrosion along the Mass Rapid Transit (MRT) North East Line (NEL) tunnel in Singapore. The corrosion rates of carbon steel 1010 and zinc coupons at the buffer areas of ten stations and five cross passages along the NEL were monitored over a period of one year. The median temperatures were between 31 and 36°C while the median relative humidity varied between 43 and 53%. At all exposure sites, the values of relative humidity corresponding to the 75th percentile values were below 60%, with very few data points registering above 80%. The cross passages showed a lower degree of fluctuations in the temperature and relative humidity compared to the buffer areas. The corrosivity levels showed some differences between exposure sites, but their values were generally low and could be categorised as C1 according to the ISO 9223:2012 categorisation. A set of procedures for an accelerated laboratory test to approximate the corrosion in the tunnel was also studied. The test procedures involved the exposure to a salt fog containing 0.12% Na 2 SO 4 + 0.05% NaCl, followed by a drying phase and subsequent exposure to a constant temperature of 40°C and a constant relative humidity of 60%. It was found that after exposure for 80 h, the accelerated tests were able to generate the degree of corrosion observed in the most severe conditions in the field.

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“…Surface dross defects can seriously affect the quality of steel sheets, making the galvanized sheets unable to meet client requirements and causing adverse effects on subsequent coating processing, thereby bringing great economic loss to steel sheet manufactures and hurting the image of their products in the market, thus special attention must be paid to them. In this context, studying the causes and prevention measures of surface dross defects is of great significance for improving the product quality [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Causes and Prevention Measures of Bright Pitting Defects on Surface of Hot-Rolled Galvalume Steel Sheets

Shi¹,

Qian-hua²,

Wen³

2022

IJHT

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Objective of this study is to find a way to control the generation of bright pitting defects on the surface of hot-rolled galvalume steel sheets produced using the United States Corp method. In our study, Scanning Electron Microscope (SEM) and Energy Disperse Spectroscopy (EDS) were used to analyze the microscopic characteristics and components of the said defects, and it's found that the cause of Type-I pitting defects is the dross residuals in the zinc kettle that are adhered to the surface of the strip steel caused by improper setting of the air-knife blowing process; and the cause of Type-Ⅱ pitting defects is the suspended particles or intermediate alloy particles entering the coating layer from the zinc kettle. Methods such as strictly controlling the compositions of aluminum-zinc ingots, adjusting the parameters of the air knife during the production process, regularly picking up bottom dross and irregularly picking up surface dross remaining in the equipment, and regularly cleaning the equipment could be taken to tighten the monitoring and management of dross in the kettle, ensure the purity of the plating solution, and effectively solve the bright pitting defects. This study provides a guidance for steel sheet manufactures to improve their manufacturing techniques and control the production process.

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Benchmarking of Zinc Coatings for Corrosion Protection: A Detailed Characterization of Corrosion and Electrochemical Properties of Zinc Coatings

Cited by 6 publications

References 19 publications

Outdoor atmospheric corrosion of carbon steel and weathering steel exposed to the tropical‐coastal climate of Thailand

Outdoor atmospheric corrosion of carbon steel and weathering steel exposed to the tropical‐coastal climate of Thailand

Accelerated corrosion test and field test of steel and zinc coupons at buffer areas and cross passages in a mass rapid transit tunnel

Causes and Prevention Measures of Bright Pitting Defects on Surface of Hot-Rolled Galvalume Steel Sheets

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