ANALYSIS AND MICROHARDNESS PROFILE OF HOT DIPPING COATING ON LOW-ALLOY STEEL

2020 ◽  
pp. 2050059
Author(s):  
ABEER SHEHAB ◽  
ATHIL AL-EZZI ◽  
ALI AL KATAWY
Keyword(s):  
Alloy Steel ◽  
Steel Surface ◽  
Zinc Coating ◽  
Hardness Profile ◽  
Low Alloy Steel ◽  
Zinc Bath ◽  
Pure Zinc ◽  
Microhardness Profile ◽  
Steel Aisi ◽  
Dipping Process

This research is an effort to understand the morphology of the coating produced during hot dipping process in pure zinc bath based on iron–zinc phase diagram. In this investigation, zinc coating on low-alloy steel AISI 4340 samples was applied by hot dipping method followed by an annealing process. Morphological characterizations of the steel surface layer were accomplished by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometry (EDS). Results revealed that the coating is bonded to the steel surface through a sequence of Fe–Zn layers namely alpha ([Formula: see text], delta ([Formula: see text] and zeta ([Formula: see text] with uniform sloping hardness profile.

Mechanical Properties of Layers Obtained by DC-Pulsed Plasma Nitriding on a Low-Alloy Steel (AISI 4140)

2009 ◽  
Vol 6 (S1) ◽  
pp. S314-S320 ◽  
Author(s):  
Luciano Dutrey ◽  
Evangelina De Las Heras ◽  
Hernán G. Svoboda ◽  
Pablo A. Corengia
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Plasma Nitriding ◽  
Pulsed Plasma ◽  
Low Alloy Steel ◽  
Aisi 4140 ◽  
Steel Aisi

scholarly journals Structural Aspects of Decreasing the Corrosion Resistance of Zinc Coating Obtained in Baths with Al, Ni, and Pb Additives

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 385 ◽  
Author(s):  
Henryk Kania ◽  
Mariola Saternus ◽  
Jan Kudláček
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Zinc Coating ◽  
Neutral Salt ◽  
Zinc Bath ◽  
Coating Structure ◽  
Humid Atmosphere ◽  
Pure Zinc ◽  
Si Content ◽  
Structural Aspects

The article presented the results of tests determining the synergistic effect of Al, Ni, and Pb additions on a zinc bath on the structure and corrosion resistance of coatings obtained on low silicon steel. Analyzed coatings were produced on S235JRG2 steel with Si content of 0.02 mass%. The corrosion resistance of the coatings was compared with the corrosion resistance of the coating obtained in the "pure" zinc bath. Structure at high magnifications (SEM) was determined, as well as coating thickness and chemical composition in microspheres. The corrosion resistance of the coatings was established comparatively in standard corrosion tests in neutral salt spray and a humid atmosphere containing SO2. It was found that the addition of Pb to the zinc bath reduced the corrosion resistance of the coatings. In the coating structure obtained in the Zn-AlNiPb bath, lead precipitation was observed in both the outer layer and the intermediate layer of the coating. Grain boundaries were the preferred site for lead precipitation. The presence of Pb precipitates favored conditions for the creation of additional corrosion cells, which led to a decrease in the corrosion resistance of the coatings.

scholarly journals Corrosion Performance of High Strength Low Alloy Steel AISI 4135 in the Marine Splash Zone

2017 ◽  
Vol 85 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Yanliang HUANG ◽  
Xiuming YU ◽  
Qichao ZHANG ◽  
Roland DE MARCO
Keyword(s):  
Alloy Steel ◽  
High Strength ◽  
Splash Zone ◽  
Low Alloy Steel ◽  
Corrosion Performance ◽  
Steel Aisi

Modification of Low-Alloy Steel Surface by Plasma Electrolytic Nitriding

2016 ◽  
Vol 25 (7) ◽  
pp. 2576-2582 ◽  
Author(s):  
S. A. Kusmanov ◽  
A. A. Smirnov ◽  
S. A. Silkin ◽  
P. N. Belkin
Keyword(s):  
Alloy Steel ◽  
Steel Surface ◽  
Low Alloy Steel ◽  
Plasma Electrolytic

Modification of Low-Alloy Steel Surface by High-Temperature Gas Nitriding Plus Tempering

2018 ◽  
Vol 27 (2) ◽  
pp. 361-367 ◽  
Author(s):  
Dongling Jiao ◽  
Minsong Li ◽  
Hongzhen Ding ◽  
Wanqi Qiu ◽  
Chengping Luo
Keyword(s):  
High Temperature ◽  
Alloy Steel ◽  
Steel Surface ◽  
Low Alloy Steel ◽  
Gas Nitriding ◽  
High Temperature Gas

Molybdenum-mediated chemotaxis of Pseudoalteromonas lipolytica enhances biofilm-induced mineralization on low alloy steel surface

2019 ◽  
Vol 159 ◽  
pp. 108123 ◽  
Author(s):  
Zhangwei Guo ◽  
Weiquan Wang ◽  
Na Guo ◽  
Zhenshun Zeng ◽  
Tao Liu ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Steel Surface ◽  
Low Alloy Steel

scholarly journals Microstructure Characterization and Corrosion Resistance of Zinc Coating Obtained in a Zn-AlNiBi Galvanizing Bath

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 758
Author(s):  
Henryk Kania ◽  
Mariola Saternus ◽  
Jan Kudláček ◽  
Jakub Svoboda
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Zinc Coating ◽  
Corrosion Current ◽  
Neutral Salt ◽  
Zinc Bath ◽  
Electrochemical Test ◽  
Humid Atmosphere ◽  
Pure Zinc ◽  
The Impact

The article examines the impact of the addition of Al, Ni, and Bi to a zinc bath on the microstructure and corrosion resistance of hot dip galvanizing coatings. The microstructure on the surface and the cross-section of the coatings obtained in the Zn-AlNiBi bath were examined. The corrosion resistance of the coatings was assessed by the standard neutral salt spray test (EN ISO 9227), the sulfur dioxide test in a humid atmosphere (EN ISO 6988), and the electrochemical test. The corrosion resistance of Zn-AlNiBi coatings was compared with the corrosion resistance of coatings attained in the bath of “pure” zinc. The corrosion tests showed higher corrosion wear of the coating obtained in the Zn-AlNiBi bath and a higher value of the corrosion current density for this coating. It was found that the cause of the reduction of the corrosion resistance of the coating, in contrast to the coating obtained in the “pure” zinc bath, may be the presence of bismuth precipitates in the coating, which may form additional corrosion cells.

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