Corrosion Performance of Aluminum-containing Zinc Coatings

Tang, Nai‐Yong; Liu, Yihui

doi:10.2355/isijinternational.50.455

Cited by 16 publications

(9 citation statements)

References 4 publications

(4 reference statements)

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“…Corrosion gradually occurred throughout the entire eutectic area (Figure 9), which was also reflected by a macroscopically visible color change over the sample surface where eutectics formed. The selective dissolution of eutectic areas has also been documented in other works [18,24,37]. Despite this, the local dissolution of η phase dendrites was also observed at higher magnifications (Figure 9a).…”

Section: Sem Surface Evaluation After Corrosion Testssupporting

confidence: 82%

Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy

Lachowicz

Jasionowski

2020

Materials

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The main purpose of this work was to experimentally determine the effect of the cooling rate during the eutectoid transformation on the corrosion resistance of a hypoeutectic Zn-4Al cast alloy in 5% NaCl solution. This was considered in relation to the alloy microstructure. For this purpose, metallographic and electrochemical studies were performed. It was found that the faster cooling promoted the formation of finer (α + η) eutectoid structures, which translated into a higher hardness and lower corrosion current density. In the initial stage of corrosion processes the eutectoid structure in the eutectic areas were attacked. At the further stages of corrosion development, the phase η was dissolved, and the α phase appears to be protected by the formation of corrosion products.

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Section: Sem Surface Evaluation After Corrosion Testssupporting

confidence: 82%

Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy

Lachowicz

Jasionowski

2020

Materials

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“…When their formation takes place in the presence of chlorine, a simonkolleite with the formula Zn 5 (OH) 8 Cl 2 ·H 2 O is also formed [ 27 , 28 ]. The formation of corrosion products may be accompanied by the formation of smithsonite with the formula ZnCO 3, or gordaite with the formula Na 4 Zn 4 SO 4 (OH) 6 Cl 2 ·H 2 O [ 27 , 29 , 30 ]. In the EDX spectrum obtained from white corrosion products, no presence of aggressive ions such as chlorides, which could accelerate the corrosion, was observed ( Figure 5 ).…”

Section: Research and Discussionmentioning

confidence: 99%

Influence of Corrosion on Fatigue of the Fastening Bolts

Lachowicz

2021

Materials

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The aim of the present work was to evaluate high-strength bolt corrosion fatigue based on metallographic examinations. The conducted tests were focused on the analysis of damaged martensitic bolts. It was found that the combined presence of cyclic loads and a corrosive environment was the cause of the accelerated fatigue of the fastening bolts. The tests carried out indicate that the actual operating conditions were different than expected. The corrosion contributed to the loosening of the bolts and initiation of fatigue cracks in the bolt threads. Further damage of the galvanized bolts was caused by fatigue crack growth in their threaded part that propagated towards the centre of the material. Cracks in the zinc coating were transferred to the steel substrate. The corrosion was favored by the oxygen concentration cell and numerous radial cracks appear in the zinc coating. The vibrations accompanying the operation of the wind tower led to their further propagation and the formation of the fatigue fracture in one of the bolts.

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“…An aluminum concentration of a percentage lower than 0.01% is maintained in the zinc bath upon using bath flux. The coating in both zinc and steel are applied to protect the metal against corrosion [18].…”

Section: Corrosion Rate Vs Wt% Of Al For 20% Nacl Solutionmentioning

confidence: 99%

Mechanical and Corrosive Nature of Galvanized Steel in Sodium Chloride Solution

Chowdhury

Aisyah

2018

JEMMME

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Galvanizing also denoted as zinc coating is a scientifically approved method applied to protect iron and steel against the effects of corrosion. In the galvanization process, aluminum is added with zinc. Zinc has numerous properties under different environmental conditions. These properties are subject to change when it comes to the coating process. The common properties here may include its appearance, hardness, the thickness along with other mechanical and physical properties. Due to these properties, there may also be inconsistency on the coating structure. So the addition of aluminum unto zinc, will ensure that various properties are eliminated for the better improvement of the zinc coating process. Aluminum possesses stronger mechanical properties and therefore valid for the coating process. It ensures that zinc is not arrived at by the corrosion agents. In this study, the focus will largely be based on the impact of aluminum on corrosion behavior as aligned to hot-dip galvanized steel. However, in this study, the galvanization process was performed using the dry process. The percentage variation of zinc resulted in different results in the rate of corrosion. The hardness of zinc thus increased via additional of aluminum percentage.

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Corrosion Performance of Aluminum-containing Zinc Coatings

Cited by 16 publications

References 4 publications

Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy

Effect of Cooling Rate at the Eutectoid Transformation Temperature on the Corrosion Resistance of Zn-4Al Alloy

Influence of Corrosion on Fatigue of the Fastening Bolts

Mechanical and Corrosive Nature of Galvanized Steel in Sodium Chloride Solution

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