Evaluation of the Corrosion Resistance of Different Galvanized Steels Treated in Cerium Salt-Based Solutions

2019 ◽  
Vol 1 (9) ◽  
pp. 133-152
Author(s):  
Florian Mansfeld ◽  
Yon-Kyun Song ◽  
Leif Speckert
Keyword(s):  
Corrosion Resistance ◽  
Galvanized Steels ◽  
Cerium Salt

Corrosion Resistance of Conversion Film Formed on Aluminium Alloy Using Cerium Salt Surface Treatment

2002 ◽  
Vol 18 (3) ◽  
pp. 224-227 ◽  
Author(s):  
W. Zhang ◽  
J.-Q. Li ◽  
Y.-S. Wu ◽  
J.-T. Xu ◽  
K. Chen
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Aluminium Alloy ◽  
Cerium Salt

Influence of Additional Alloying Elements on Corrosion Resistance of Hot Dip Galvanised Steels

2012 ◽  
Vol 730-732 ◽  
pp. 811-816 ◽  
Author(s):  
Alexandru Alexa ◽  
Tamara Radu ◽  
Florentina Potecasu ◽  
Anisoara Ciocan
Keyword(s):  
Corrosion Resistance ◽  
Diffusion Process ◽  
Dip Coating ◽  
Alloying Elements ◽  
Coating Process ◽  
Accelerated Corrosion ◽  
Protective Layers ◽  
Galvanized Steels ◽  
Simulated Environment ◽  
Improved Performance

The alloying of the zinc with some additional elements in specific quantities could be reliably used in the hot-dip coating process. These elements form specific intermetallic compounds that conferred substantially improved performance to the end-product specially by improving of the corrosion resistance. The paper presents the research that has developed to analyze the influence of aluminum, bismuth and tin like alloying elements added in the zinc on corrosion resistance of galvanized steels. Steel samples were galvanized by the hot-dip method in micro-alloyed zinc baths. The influence of the alloying elements on the formation of the different phases and on the diffusion process is discussed. The corrosion experiments were carried out in a simulated environment of accelerated corrosion conditions. The kinetics and the mechanism of corrosion of the samples were studied in correlation with the effect of alloying elements on nature and characteristics of protective layers.

Enhancing adhesion and anti-corrosion performance of hot-dip galvanized steels by sandblasting/phosphating co-treatment

2021 ◽  
Author(s):  
Jingwen Zhang ◽  
Gang Kong ◽  
Wenjun Wang ◽  
Shuanghong Zhang ◽  
Chunshan Che
Keyword(s):  
Corrosion Resistance ◽  
Steel Structures ◽  
Corrosion Damage ◽  
Organic Coating ◽  
Grit Blasting ◽  
Duplex Coating ◽  
Galvanized Steels ◽  
Zinc Plating ◽  
Long Time ◽  
Galvanized Coating

Abstract The substations outdoor steel structures employed in aggressive marine environments can accelerate corrosion damage and cause incredible degradation of performance. Hot-dip galvanizing and organic coating dual-coated anticorrosion system is currently the most effective and efficient protection strategy. In present paper, sandblasting and phosphating technique were applied to the surface of zinc plating, the effect of various grit-blasting and phosphating technology conditions on the adhesion performance and corrosion resistance of duplex-coated system were systematically investigated. Results revealed that the bonding strength of the duplex coating after grit-blasting and phosphating pretreatment was 3.25 and 2.71 times higher than that of the untreated, respectively. In particular, sandblasting and phosphating coprocessing of duplex coating could furtherly improve the adhesion behavior and corrosion resistance, which mainly due to their synergistic effect. Sandblasting can rough the surface of galvanized coating and generate many pits and scratches. Thus, phosphating can form more needle-like zinc phosphate crystals in those positions, anchoring and pinning firmly the interface between galvanized coating and organic coating. Meanwhile, the phosphating film still acted as an anti-corrosion physical barrier to hinder the intrusion of corrosive medium and protect galvanized steels from storage rust before painting for a long time.

Research on Cerium Conversion Coating on ZM5 Magnesium Alloy

2014 ◽  
Vol 936 ◽  
pp. 1082-1085
Author(s):  
Rong Xia Zhu ◽  
Guo Mian Gao ◽  
Zheng Miao
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Formation Mechanism ◽  
Potentiodynamic Polarization ◽  
Conversion Coating ◽  
Experimental Results ◽  
Specimen Surface ◽  
Potentiodynamic Polarization Curves ◽  
Corrosion Behaviors ◽  
Cerium Salt

The conversion coating formed by immersion in a solution containing cerium salt on ZM5 magnesium alloy was studied and the corrosion resistance was evaluated as well. These micrographs of specimen surface were investigated by metallographic microscope. The corrosion behaviors of ZM5 magnesium alloy and conversion coating were assessed by means of potentiodynamic polarization curves and immersion tests. The experimental results indicated that a yellow-brown conversion coating was formed subsequently on the specimen surface. The results of electrochemical measurements and immersion tests revealed that the cerium conversion coating possessed better corrosion resistance than the substrate. In this study, cerium conversion coatings formed on ZM5 magnesium alloy were characterized and the formation mechanism was discussed.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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