scholarly journals The corrosion resistance of zinc coatings in the presence of boron-doped detonation nanodiamonds (DND)

2017 ◽  
Vol 175 ◽  
pp. 012019
Author(s):  
G K Burkat ◽  
G S Alexandrova ◽  
V Yu Dolmatov ◽  
E D Osmanova ◽  
V Myllymäki ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Detonation Nanodiamonds ◽  
Boron Doped ◽  
Zinc Coatings

Understanding the low corrosion potential and high corrosion resistance of nano-zinc electrodeposit based on electron work function and interfacial potential difference

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97606-97612 ◽  
Author(s):  
Qingyang Li ◽  
Hao Lu ◽  
Juan Cui ◽  
Maozhong An ◽  
Dongyang (D. Y.) Li
Keyword(s):  
Corrosion Resistance ◽  
Work Function ◽  
Corrosion Potential ◽  
Electron Work Function ◽  
Coarse Grained ◽  
High Corrosion Resistance ◽  
Corrosion Behaviors ◽  
Interfacial Potential ◽  
Nano Zinc ◽  
Zinc Coatings

The corrosion behaviors of coarse-grained and nanocrystalline zinc coatings and correlated the corrosion potential with electron stability are investigated.

scholarly journals Impact of Bi and Sn on Microstructure and Corrosion Resistance of Zinc Coatings Obtained in Zn-AlNi Bath

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3788
Author(s):  
Henryk Kania ◽  
Mariola Saternus ◽  
Jan Kudláček
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Neutral Salt ◽  
Energy Dispersion Spectroscopy ◽  
Humid Atmosphere ◽  
Alloying Additions ◽  
Electrochemical Parameters ◽  
Zinc Coatings ◽  
Structural Research ◽  
The Impact

The paper presents results of studies on the impact of bismuth and tin additions to the Zn-AlNi bath on microstructure and corrosion resistance of hot dip galvanizig coatings. The structure at high magnifications on the top surface and cross-section of coatings received in the Zn-AlNiBiSn bath was revealed and the microanalysis EDS (energy dispersion spectroscopy) of chemical composition was determined. The corrosion resistance of the coatings was tested relatively in a neutral salt spray test (NSS), and tests in a humid atmosphere containing SO2. Electrochemical parameters of coatings corrosion were determined. It was found that Zn-AlNiBiSn coatings show lower corrosion resistance in comparison with the coatings received in the Zn-AlNi bath without Sn and Bi alloying additions. Structural research has shown the existence of precipitations of Sn-Bi alloy in the coating. It was found that Sn-Bi precipitations have more electropositive potential in relation to zinc, which promotes the formation of additional corrosion cells.

The Corrosion of HDG Zinc Coatings on the Road and Urban Infrastructures

2015 ◽  
Vol 227 ◽  
pp. 217-220
Author(s):  
Agnieszka Królikowska ◽  
Leszek Komorowski
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Gravimetric Method ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
The Road ◽  
On The Road ◽  
Zinc Coatings ◽  
Scanning Electron

The standard ISO 14713-1 shows that HDG coatings should protect steel in the corrosive atmosphere C5 for 10–21 years. It was observed that pitting corrosion appears already after 2–3 years on roads and urban infrastructures and both Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) have shown that lead inclusions were present in all such corroded zinc coatings. The laboratory prepared HDG coatings with different amount of lead inclusions were investigated by gravimetric method (after exposure in salt chamber), SEM with EDS, and Glow Discharge Optical Emission Spectrometry (GDOES). The corrosion resistance was analyzed in the polarization tests and local probe techniques. The inclusions could accelerate coating corrosion because lead is cathodic to zinc.

Corrosion Resistance of Pulse Zinc Coatings

2019 ◽  
Vol 25 (29) ◽  
pp. 51-58 ◽  
Author(s):  
Matilda Zemanová ◽  
Marie Cocural
Keyword(s):  
Corrosion Resistance ◽  
Zinc Coatings

Structural Properties of Zinc and ZnMgAl Coatings on Steel Sheets

2014 ◽  
Vol 782 ◽  
pp. 623-626 ◽  
Author(s):  
Mária Kollárová ◽  
Lucia Hrabčáková ◽  
Juraj Graban ◽  
Marta Šohajová
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Neutral Salt ◽  
Coating Structure ◽  
Properties Of Coatings ◽  
Steel Sheets ◽  
Mutual Comparison ◽  
Excellent Adhesion ◽  
Interdendritic Phase ◽  
Zinc Coatings

In the paper mutual comparison of zinc coatings enriched with small additions of Mg and Al (up to 1 wt.% Mg and 1 wt.% Al) and traditional zinc coatings produced by hot dip galvanizing, concerning some important properties of coatings like coating structure, cracks formation after deformation and corrosion resistance of deformed samples was studied. It was shown, that while traditional hot-dip zinc coatings are formed by homogenous zinc layer, exhibiting only low amount of soluble aluminium, coatings enriched by small amounts of Mg and Al, namely 0.6% Mg and 0.8% Al are formed by dendritic zinc matrix and interdendritic phase containing Zn-Mg-Al eutectics. Development of cracks was investigated in the area of maximal deformation of the samples subjected to stretching. It was found, that while traditional zinc coatings showed sporadic long fine cracks, zinc coatings enriched with Mg and Al exhibited aggregation of short thick cracks in the deformed area. Samples of both materials after stretching were also exposed in neutral salt spray atmosphere in corrosion chamber. It can be concluded, that material with coatings enriched with Mg and Al showed better results in corrosion tests contrary to the presence of massive cracks in the coating. This significantly increased corrosion resistance is possible due to excellent adhesion of zinc coatings, containing Mg and Al on drawing steels.

Corrosion resistance of zinc electrodeposited from acidic and alkaline electrolytes using pulse current

2009 ◽  
Vol 63 (5) ◽  
Author(s):  
Matilda Zemanová
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Pulse Current ◽  
Zinc Coating ◽  
Accelerated Corrosion ◽  
X Ray ◽  
Before And After ◽  
Alkaline Electrolytes ◽  
Zinc Coatings ◽  
Chrome Iii

AbstractCorrosion resistance of zinc coatings was investigated in an accelerated corrosion test in a condensation chamber. Zinc was electrodeposited from alkaline and acidic electrolytes using direct current (DC) or pulse current (PC). The zinc coating was subsequently protected against corrosion with a chrome (III) layer. Morphology and structure of the coatings was investigated using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD) before and after the corrosion test. Corrosion resistance of alkaline zinc coatings electrodeposited with DC and PC under test conditions was found to be comparable. The corrosion resistance of zinc coatings deposited from acidic electrolytes by PC was lower in comparison with corrosion resistance of zinc coatings deposited using DC.

Study of Microstructure and Corrosion Resistance of Zinc Electrodeposits before and after Black Chromating

2017 ◽  
Vol 751 ◽  
pp. 119-124
Author(s):  
Kanokwan Saengkiettiyut ◽  
Pranee Rattanawaleedirojn ◽  
Adisak Thueploy ◽  
Jumpot Wanichsampan ◽  
Yuttanant Boonyongmaneerat
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Alkaline Electrolyte ◽  
Corrosion Properties ◽  
Electrochemical Testing ◽  
Before And After ◽  
Coat Layer ◽  
Zinc Coatings ◽  
Salt Spray Testing

In this work, microstructure and corrosion properties of zinc electroplated steel before and after black chromating was investigated. The test samples were prepared by electrodeposition process, using a commercially-available alkaline electrolyte. Subsequently, the galvanized samples were applied with a black chromate-based passivation layer and a clear top-coat layer. Their microstructures were examined using X-ray diffractometry and scanning electron microscopy. The corrosion resistance of the samples was assessed with the salt spray test, following the ASTM B117, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization in 5 wt.% NaCl solutions. The study showed that zinc electroplated steels exhibit (110) crystallographic orientation. The passivation and top-coat layers did not affect the microstructure of the zinc layer, and covered uniformly on the zinc layer for all sets of samples. The corrosion resistant results obtained from salt spray testing and electrochemical testing revealed that the microstructure of zinc coatings prepared by using different applied current did not influence on their corrosion resistance markedly. While black passivation followed by top coating provided a significant improvement on corrosion resistance of the coatings.

Sign in / Sign up

Export Citation Format

Share Document