Development and preparation of oxide mixture-based pigments for anticorrosion paints

Purpose The aim of the work is to develop an anticorrosion pigment based on an oxide mixture with lamellar particles. The pigments are prepared from lamellar zinc, zinc oxide and magnetite by calcination. An alkaline earth carbonate is added when embedding a third cation in the lattice of the ferrite that forms the envelope of the lamellar zinc. The properties of the pigments are tested both in the powdered state and when embedded in an epoxy-ester system using different pigment volume concentrations (PVC). Design/methodology/approach The properties of paints containing synthesised oxide mixture-based pigments at various volume concentrations and with the Q factor – Q = PVC/CPVC = 0.65 – were examined (where CPVC is critical pigment volume concentration). A series of isometric ferrite pigments were also synthesised for a comparison. Paints of both types with PVC = 10, 15 and 20 per cent were formulated. Steel panels coated with the paints were subjected to corrosion and mechanical tests. Findings The oxide mixtures with lamellar particles were subjected to particle size analysis and found to make up a broad distribution curve. Electron microscopy photographs confirmed that the oxide mixture pigments contained lamellar particles with a surface layer. A high anticorrosion effect was achieved owing to the combination of different oxide types. Research limitations/implications The properties of the oxide mixtures with lamellar particles are described. Their particle distribution curves can be obtained by particle size analysis methods with a view to obtaining additional information on the status and properties of the pigment particles that may be useful in the development of better paints/coating materials. Practical implications Oxide mixtures with lamellar particles can be used in paints protecting construction steel. Originality/value The composition of the prepared oxide mixture-based pigments is novel. Each oxide acts by its own anticorrosion mechanism and the final beneficial effect is due to their concerted action.

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High Resolution Particle Size Analysis of Coating Materials: II. Achieving Accurate and High Resolution Results

Surface Phenomena and Additives in Water-Based Coatings and Printing Technology ◽

10.1007/978-1-4899-2361-5_15 ◽

1991 ◽

pp. 191-203

Author(s):

John C. Thomas

Keyword(s):

Particle Size ◽

High Resolution ◽

Particle Size Analysis ◽

Size Analysis ◽

Coating Materials

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Particle size characterization as a support for sediment contamination analysis

Management of Environmental Quality An International Journal ◽

10.1108/meq-07-2015-0157 ◽

2017 ◽

Vol 28 (4) ◽

pp. 462-476 ◽

Cited By ~ 4

Author(s):

Felippe Fernandes ◽

Cristiano Poleto

Keyword(s):

Particle Size ◽

Particle Size Analysis ◽

Metropolitan Region ◽

Size Analysis ◽

Content Type ◽

Fine Sediments ◽

Water Courses ◽

Different Depths ◽

Particle Size Characterization ◽

Different Characteristics

Purpose The purpose of this paper is to analyse the results of particle size profiles carried out in the dam Mãe d’água, located in the metropolitan region of Porto Alegre, Rio Grande do Sul, becoming a tool of support for geochemistry evaluation works of sediments in this basin. Design/methodology/approach The methodology comprised the particle size analysis of eight cores sampled using the extraction profile technique “Sampling Cores.” A total of 56 sub-samples were obtained at different depths, varying between 0 and 52 cm. The particle size analysis of the sub-samples was carried out with the protocol relating to Brazilian analysis standards NBR 7,181; for determination of the particle size distribution of thick sediments, the sieve method was used, and for fine sediments, the pipette method was used. Findings The results show that for the different depths, the sediment profiles show similarity in their sedimentary deposition layers. Cores T1, T6, T7 and T8 showed a classification with predominance of mud. Cores T2 and T5 showed variations throughout their sedimentary profile, varying of mud predominance to sand with gravel, and on cores T3 and T4, the predominant characteristic is sand with mud and sand with gravel, respectively. Originality/value It can be seen in this paper that energy of sedimentological flow reaches it in a different way, creating these three sectors (first, sand with gravel; second, sand with mud and third, mud) with different characteristics – morphodynamic and sedimentological. These characteristics are important for the study of the heavy metals on the soil and therefore for reducing the risk of contamination of water courses.

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Characterization and Comparison of Thermally Sprayed Hard Coatings as Alternative to Hard Chrome Plating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.974.183 ◽

2014 ◽

Vol 974 ◽

pp. 183-187 ◽

Cited By ~ 8

Author(s):

K. Meekhanthong ◽

S. Wirojanupatump

Keyword(s):

Particle Size ◽

Particle Size Analysis ◽

Hard Coatings ◽

Size Analysis ◽

Chemical Compositions ◽

Coating Materials ◽

Hvof Coating ◽

Wear And Corrosion ◽

Hard Chrome ◽

Thermally Sprayed

Thermal spray coatings have become one of the most potential for hard chrome replacement, particularly for wear and corrosion applications. In this study four types of hard coating materials were selected and thermally sprayed by suitable processes as the following designated codes (material/spray technique): Cr-Fe/HVOF, Cr-Ni/HVOF, WC-Ni/SF and Cr-Fe/AS. All of starting materials were characterized in order to create a correlation between spray materials and coating characteristics. SEM was employed for morphology and microstructure investigation. Particle size analysis was investigated by SEM and laser particle size analyzer. Coating characterization included surface roughness measurment by profilometer, porosity evaluation by image analysis and hardness test by Vicker microhardness tester. Microstructure of coatings was also revealed by SEM. Wear performance was evaluated by pin on disc test and dry sand rubber wheel abrasion test. Corrosion resistance was tested by potentiodynamic method. The results showed that particle size and morphology of starting powders were various depending on manufacturing method. Chemical compositions of starting materials showed great effect on coating properties and performance. Coatings deposited by HVOF and spray & fuse (SF) method showed typically dense and homogeneous structure than arc sprayed coating. WC-Ni/SF coating showed lowest abrasive wear rate compared to other thermally sprayed coatings. All Ni base coatings had significantly lower corrosion rates while Cr-Ni/HVOF coating had lowest corrosion rate. Although Cr-Ni/HVOF and WC-Ni/SF could be applicable for both wear and corrosion applications, for heat sensitive parts, Cr-Ni/HVOF coating could be a better alternative to spray and fuse.

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The influence of crystalline structure of cellulose in chitosan-based biocomposites on removal of Ca(II), Mg(II), Fe(III) ion in aqueous solutions

Cellulose ◽

10.1007/s10570-021-03899-3 ◽

2021 ◽

Author(s):

Aleksandra Grząbka-Zasadzińska ◽

Izabela Ratajczak ◽

Katarzyna Król ◽

Magdalena Woźniak ◽

Sławomir Borysiak

Keyword(s):

Particle Size ◽

Composite Materials ◽

Metal Ion ◽

Supermolecular Structure ◽

Absorption Spectrometry ◽

Mechanical Tests ◽

Particle Size Analysis ◽

Polymorphic Form ◽

Size Analysis ◽

Flame Atomic Absorption

AbstractIn this work, the influence of the supermolecular structure of cellulosic fillers in chitosan matrix on the process of adsorption of calcium, magnesium and iron metal ion was analyzed, while using techniques such as: X-ray diffraction, flame atomic absorption spectrometry, FTIR spectroscopy, particle size analysis, and wettability angle. It has been shown that polymorphic form of cellulose significantly affects its particle size. The introduction of cellulosic filler into polymer matrix was responsible for changes in the sorption efficiency of chitosan composites. It was found that materials with nanocellulose II were characterized with the highest efficiency of adsorption. This interesting relationship has not been reported in the literature, yet. It is important especially in terms of designing composite materials with high adsorption capacity. In the presented paper this issue was discussed, taking into account crystallographic aspects as well as changes in the hydrophilicity of the surface of composite materials. Composite materials were also subjected to mechanical tests which showed some interesting increase in tensile strength when compared to the unfilled polymer.

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