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Phosphate Conversion Coating – A Short Review

D.-P. Burduhos-Nergis A.V. Sandu D.D. Burduhos-Nergis P. Vizureanu C. Bejinariu
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1029-1034 | DOI: 10.24425/amm.2023.145471
Keywords conversion coatings phosphate review corrosion properties
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Abstract

Phosphating is the process of depositing, by conversion, a layer of insoluble phosphate compounds, on the metal’s surface. Although phosphate coatings have been studied since the early nineteenth century, they are not only still being studied, but are an area of interest due to their many applications. The advantages of these types of coatings are well known, such as the low cost of the deposition process, the improvement of corrosion resistance properties, and the improvement of wear resistance and adhesion of further deposited layers such as paint. All this, leads to studies on the constant improvement of the properties of the phosphate coating, by modifying the parameters of the phosphating process, as well as by modifying/replacing the substances used in the phosphating solutions with “environmentally friendly” solutions. Also due to these advantages, several researchers are studying the possibility of using phosphate coatings in fields such as civil engineering or medicine (biomaterials coatings). This paper aims to present some essential aspects of phosphating and to bring to the fore the latest research on “eco-friendly” phosphating solutions and the possibility of using the phosphating process in other fields, such as the medical field. Also, the paper aims to discuss the possibility of eliminating/reducing the harmful effect that the use of phosphating has on the environment.
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Authors and Affiliations

D.-P. Burduhos-Nergis
1
ORCID: ORCID
A.V. Sandu
1
ORCID: ORCID
D.D. Burduhos-Nergis
1
ORCID: ORCID
P. Vizureanu
1
ORCID: ORCID
C. Bejinariu
1
ORCID: ORCID
  1. “Gheorghe Asachi” Technical University of Iasi, Faculty of Materials Science and Engineering, 41 “D. Mangeron” Street, 700050, Iasi, Romania

Investigation of Mechanical and Corrosion Properties of Al 7075/Garnet Metal Matrix Composites by Two-stage Stir Casting Process

M. Sambathkumar P. Navaneethakrishnan K.S.K. Sasikumar R. Gukendran K. Ponappa
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1123-1129 | DOI: 10.24425/amm.2021.136432
Keywords Al 7075 garnet Two-Stage Stir Casting Mechanical Properties corrosion properties
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Abstract

The impact of Garnet addition into the AL7075 Aluminium matrix on the physical, mechanical and corrosion properties are studied in this research paper. Al 7075/garnet composites are fabricated by using two-stage stir casting method in different (0, 5, 10, 15) volume percentages. Photomicrograph of prepared samples revealed the uniform distribution of garnet reinforcement into the base matrix. The corrosion rate is calculated by potentiodynamic polarization method. The actual density is increased by around 1.2% for Al 7075 / garnet (15%) composite as compared to base alloy. Micro hardness of Al 7075 / garnet (15%) composite is raised by around 47 (34%) compare to as cast base matrix. Al7075 / garnet (15%) composite tensile strength stood at 252 Mpa, which is 40% greater than the base alloy. Al 7075 / 15% garnet composites reduce around 97% of corrosion rate than the base matrix. Alloy elements influenced the corrosion than Garnet reinforcement.
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Bibliography

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Authors and Affiliations

M. Sambathkumar
1
ORCID: ORCID
P. Navaneethakrishnan
1
ORCID: ORCID
K.S.K. Sasikumar
1
ORCID: ORCID
R. Gukendran
1
ORCID: ORCID
K. Ponappa
2
ORCID: ORCID
  1. Kongu Engineering College, Department of Mechanical Engineering, Erode, Tamilnadu, India
  2. Indian Institute of Information Technology Design and Manufacturing Jabalpur, Department of Mechanical Engineering, Jabalpur, India

Effect of Tin Addition on the Degradability and Corrosion Properties of a New Zn-1.0 wt.% Mg Alloy

Zhouling Long Haiyang Lang Jun Ou
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1209-1216 | DOI: 10.24425/amm.2022.141044
Keywords Zn-1Mg alloy mechanical and corrosion properties degradability hemolysis rate
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Abstract

In this study, to investigate effects of tin addition on the microstructures and corrosion properties, Zn-1Mg-xSn (x = 1.0, 2.0 and 5.0 wt.%) ternary zinc alloys were prepared. The experimental results indicated that the Zn-1Mg-2.0 wt.% Sn alloy has the better mechanical properties compared with pure zinc and Zn-1Mg alloy. The tensile strength of the alloy material is 173.2±3.7 MPa, the yield strength is 120.7±2.4 MPa, the elongation is 5.64±0.08% and the hardness is 76.9±0.8 HV. The average degradation rate of the alloys immersion in SBF solution for 60 days is 0.16±0.03 mm/year, and the Zn-1Mg-2.0 wt.% Sn alloy hemolysis rate is only 0.81±0.02%. It is confirmed that the addition of tin is effective to improve the mechanical properties and degradation of Zn-1Mg alloy. It may be a candidate of the clinical application requirements of the degradable implant materials in orthopedics.
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Authors and Affiliations

Zhouling Long
1
ORCID: ORCID
Haiyang Lang
2
ORCID: ORCID
Jun Ou
2 3
ORCID: ORCID
  1. Materials Science and Engineering, Guilin University of Technology, China
  2. Guilin University of Technology, College of Materials Science and Engineering / Dental Clinic and Experimental Center of Medical Sciences, 12 Jianganroad, Guilin, 541004, Guilin, China
  3. Guilin Medical University, Experimental Center of Medical Sciences, 26, Huanchen Road Guilin, 541002, Guilin, China

Corrosion Behaviour Correlation of the Secondary Aluminium Casts in Natural Atmosphere and Laboratory Conditions

L. Kuchariková T. Liptáková E. Tillová M. Bonek D. Medvecká
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 4 | 1455-1462 | DOI: 10.24425/amm.2020.133713
Keywords secondary aluminium alloys high Fe content corrosion properties natural atmosphere
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Abstract

The secondary aluminium alloys are very important material in actual industry from economic and ecological point of view. The secondary aluminium used for production of casts, however, contains some elements, i.e. iron, – affecting physical, chemical and mechanical behaviour. The subject of our investigation has been corrosion behaviour in natural atmosphere of the hypoeutectic AlSi7Mg0.3 cast alloys with various content of iron, because the Fe content affects not only mechanical properties but corrosion resistance, as well. Three types of the AlSi7Mg0.3 cast alloys were exposed for 9 months in natural atmosphere and the measure of their degradation by corrosion was found by determination of the weight loss and the light microscopy. In addition, a scanning electron microscopy (SEM) analyses and evaluation of surface changes were used. The corrosion behaviour in natural atmosphere was compared to results of the carried out electrochemical and exposure laboratory experiments in chloride solutions.

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Authors and Affiliations

L. Kuchariková
ORCID: ORCID
T. Liptáková
ORCID: ORCID
E. Tillová
ORCID: ORCID
M. Bonek
D. Medvecká

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