Effects of polyethylene glycol additive on zinc phosphate conversion coating of carbon steel

This study aims to evaluate the corrosion resistance of carbon steel, used for carabiners manufacturing, coated with three different types of phosphate layer. The phosphate layers have been obtained by phosphate conversion coating with three different types of phosphate solutions: zinc-based solution, zinc-iron-based phosphate solution, and manganese-based phosphate solution. Additionally, the test was performed on zinc phosphate samples impregnated with molybdenum bisulfate-based oil and zinc phosphate samples further coated with a layer of elastomer-based paint. Considering the areas where the carabiners are used (civil engineering, navigation, oil industry, rescue operations, etc.), the corrosive environments studied are rainwater, Black Sea water, and fire extinguishing solution. The structure of the deposited layers was studied by scanning electron microscopy, while the interface structure between the alloy and corrosive environment was analyzed by electrochemical impedance spectroscopy. According to this study, the corrosion resistance of zinc-based phosphate coated samples and zinc/iron-based phosphate coated samples is higher than that of the studied carbon steel samples, despite the corrosion environment. Also, the most aggressive corrosion environment was the fire extinguishing solution.

Download Full-text

The Effect of Immersion Time and Immersion Temperature on the Corrosion Behavior of Zinc Phosphate Conversion Coatings on Carbon Steel

Materials Research ◽

10.1590/1516-1439.343814 ◽

2015 ◽

Vol 18 (4) ◽

pp. 706-713 ◽

Cited By ~ 10

Author(s):

Vahid Asadi ◽

Iman Danaee ◽

Hadi Eskandari

Keyword(s):

Carbon Steel ◽

Corrosion Behavior ◽

Immersion Time ◽

Zinc Phosphate ◽

Conversion Coatings

Download Full-text

Strontium-zinc phosphate chemical conversion coating improves the osseointegration of titanium implants by regulating macrophage polarization

Chemical Engineering Journal ◽

10.1016/j.cej.2020.127362 ◽

2020 ◽

pp. 127362

Author(s):

Da-Wang Zhao ◽

Chao Liu ◽

Kang-Qing Zuo ◽

Peng Su ◽

Lan-Bo Li ◽

...

Keyword(s):

Zinc Phosphate ◽

Macrophage Polarization ◽

Chemical Conversion ◽

Conversion Coating ◽

Titanium Implants ◽

Chemical Conversion Coating

Download Full-text

Conducting polyaniline/nano-zinc phosphate composite as a pigment for corrosion protection of low-carbon steel

Chemical Papers ◽

10.1007/s11696-016-0082-7 ◽

2016 ◽

Vol 71 (2) ◽

pp. 189-197 ◽

Cited By ~ 5

Author(s):

Pravin P. Deshpande ◽

Abhijit A. Bhopale ◽

Vandana A. Mooss ◽

Anjali A. Athawale

Keyword(s):

Carbon Steel ◽

Corrosion Protection ◽

Zinc Phosphate ◽

Low Carbon Steel ◽

Low Carbon ◽

Conducting Polyaniline ◽

Nano Zinc

Download Full-text

Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach

Electrochemical Energy Technology ◽

10.1515/eetech-2018-0006 ◽

2018 ◽

Vol 4 (1) ◽

pp. 47-54 ◽

Cited By ~ 3

Author(s):

Nilesh S. Bagal ◽

Vaibhav S. Kathavate ◽

Pravin P. Deshpande

Keyword(s):

Corrosion Resistance ◽

Electrochemical Impedance Spectroscopy ◽

Carbon Steel ◽

Impedance Spectroscopy ◽

Zinc Phosphate ◽

Electrochemical Impedance ◽

Low Carbon Steel ◽

Low Carbon ◽

Phosphate Coatings ◽

Coating Weight

AbstractThe present study aims at deposition of zinc phosphate coatings on low carbon steel with incorporated nano- TiO2 particles by chemical phosphating method. The coated low carbon steel samples were assessed in corrosion studies using electrochemical impedance spectroscopy and potentiodynamic polarization techniques (Tafel) in 3.5% NaCl solution. Morphology and chemical composition of the coatings were analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy in order to observe growth of coating. Significant variations in the coating weight, porosity and corrosion resistance were observed with the addition of nano- TiO2 in the phosphating bath. Corrosion rate of nano-TiO2 chemical phosphate coated samples was found to be 3.5 milli inches per year which was 3 times less than the normal phosphate-coated sample (8 mpy). Electrochemical impedance spectroscopy studies reveal reduction of porosity of nano-TiO2 phosphate coated samples. It was found that nano-TiO2 particles in the phosphating solution yielded uniform phosphate coatings of higher coating weight, fewer defects and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal phosphating bath).

Download Full-text