Preparation and application of a waterborne acrylic copolymer-siloxane composite: improvement on the corrosion resistance of zinc-coated NdFeB magnets

RSC Advances ◽  
2015 ◽  
Vol 5 (99) ◽  
pp. 81759-81767 ◽  
Author(s):  
Shaocheng Wang ◽  
Weiping Li ◽  
Dongxiao Han ◽  
Huicong Liu ◽  
Liqun Zhu
Keyword(s):  
Corrosion Resistance ◽  
Zinc Coating ◽  
Silica Sol ◽  
The Self ◽  
Acrylic Copolymer ◽  
Ndfeb Magnets ◽  
Copolymer Coating ◽  
Sol Precursor

In order to improve the corrosion resistance of the zinc coating on NdFeB, a novel siloxane functionalised waterborne acrylic copolymer was prepared by combining the self-produced waterborne acrylic copolymer coating with the silica sol precursor.

scholarly journals The Influence of Surface Preparation of the Steel during the Renovation of the Car Body on Its Corrosion Resistance

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 384
Author(s):  
Dariusz Ulbrich ◽  
Jakub Kowalczyk ◽  
Arkadiusz Stachowiak ◽  
Wojciech Sawczuk ◽  
Jaroslaw Selech
Keyword(s):  
Corrosion Resistance ◽  
Glass Bead ◽  
Salt Spray ◽  
Zinc Coating ◽  
Surface Preparation ◽  
The Other ◽  
Average Thickness ◽  
Spray Chamber ◽  
Car Body ◽  
Abrasive Blasting

The article presents the influence of the applied method used for removing the varnish coat on the corrosion resistance of the car body sheet. The tests were carried out on samples prepared from factory-painted car body elements with pearlescent, metallized and acrylic varnish. Removal of the varnish coat was performed by sandpaper grinding, glass bead blasting, disc blaze rapid stripping, soda blasting and abrasive blasting with plastic granules. The average thickness of the factory-painted coating depending on the type of lacquer ranged from about 99 to 140 µm. On the other hand, after removing the varnish, the thickness of the protective zinc coating ranged from 2 to 12.7 µm. The highest values of the zinc coating were obtained for samples in which the varnish was removed by the method such as soda blasting and abrasive blasting with plastic granules. For these two methods of surface preparation, the damage to the zinc layer protecting the steel against corrosion is the smallest and the percentage of zinc in the surface layer ranges from 58% to 78%. The final stage of the research was to test the samples after removing the varnish coat in a two-hour exposure to the corrosive environment in a salt spray chamber. Samples with the surface prepared by grinding with sandpaper reached the level of surface rusting Ri 5, while in the case of soda blasting and the use of plastic granules, no corrosion centers were observed on the surface of the car body sheet.

Corrosion resistance of NdFeB magnets coated by Al

1996 ◽  
Vol 32 (5) ◽  
pp. 4407-4409 ◽  
Author(s):  
N.C. Ku ◽  
C.-D. Qin ◽  
C.C. Yu ◽  
D.H.L. Ng
Keyword(s):  
Corrosion Resistance ◽  
Ndfeb Magnets

Improvement of magnetic properties and corrosion resistance of NdFeB magnets by intergranular addition of MgO

2008 ◽  
Vol 461 (1-2) ◽  
pp. 351-354 ◽  
Author(s):  
Wenjian Mo ◽  
Lanting Zhang ◽  
Aidang Shan ◽  
Lijun Cao ◽  
Jiansheng Wu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Ndfeb Magnets

scholarly journals Corrosion resistance of zinc-based systems in NaCl environment

2013 ◽  
Vol 61 (5) ◽  
pp. 1487-1495 ◽  
Author(s):  
Jiří Votava
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Current Trend ◽  
Zinc Coating ◽  
Degradation Process ◽  
Engineering Industry ◽  
Anticorrosion Protection ◽  
Al Coating ◽  
Measurement Of Thickness

Metal components in engineering, industry and agriculture are subjects of degradation process influenced by corrosion which result in changes of mechanical characteristics. The current trend of anticorrosion protection is aimed at inorganic metal zinc-based coatings, such as zinc dipping which can be improved by duplex protection. This paper deals with two types of corrosion protection of steel components by zinc coating, first of which is produced by hot dip galvanizing, the other by Zn-Al spray. Hot dip galvanizing was processed in working conditions; the Zn-Al coating was sprayed following the instructions of producer. It is a special aerosol with particles of Zn and Al sized approximately 5 µm. There have been processed the following tests: analysis of element structure, test of corrosion resistance in aggressive environment of salt spray according to ČSN ISO 9227, further measurement weight of applied coatings according to ČSN EN ISO 3892 and measurement of thickness of passivating coating. There was also made an analysis of coating tenacity on bending pin according to ČSN EN ISO 8401. Quality of applied coatings was evaluated following the metallographic scratch pattern.

Galvanised Sheets as Building Material

2014 ◽  
Vol 1020 ◽  
pp. 15-20 ◽  
Author(s):  
Janina Adamus ◽  
Monika Gierzyńska-Dolna ◽  
Wilhelm Gorecki ◽  
Piotr Lacki
Keyword(s):  
Corrosion Resistance ◽  
Civil Engineering ◽  
Zinc Coating ◽  
Key Factors ◽  
Forming Process ◽  
Factors Affecting ◽  
Steel Sheets ◽  
Steel Base ◽  
Structural Parts ◽  
The Relationship

Civil engineering uses steel as one of the basic structural materials. Sheets play an important role among the steel products. Although steel sheets are relatively cheap and have good mechanical and technological properties, low resistance against corrosion poses a fundamental weakness. A solution to this problem is the use of galvanised or organic-coated steel sheets. Galvanising can be carried out by hot dipping (single structural parts) or continuous galvanising: electrolytic and hot-dip galvanising (sheets and strips or long products, such as: wires or pipes).In the paper steel sheets used in the civil engineering as structural parts or wall and roof cladding are discussed. A special attention is paid to corrosion resistance of the steel sheets. Some results of corrosion tests is presented. The tests were aimed at determination the corrosion resistance of hot-dip and electrolytic galvanised sheets. The influence of the galvanising technology and the relationship between the degree of material deformation and susceptibility to corrosion are given. Coating thickness and kind of the applied galvanising technology is pointed as the key factors affecting the corrosion resistance of galvanised sheets. It is highlighted that during the forming process of galvanised sheets (bending, sheet-metal forming) the zinc coating deforms more than the steel base, so its thickness decreases, and therefore the corrosion resistance of the final product decreases, too.

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.

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