Corrosion of SiO2–B2O3–Al2O3–CaF2-R2O (R=Na and K) enamels with different content of ZrO2 in H2SO4 and NaOH solutions

Chen, Ken; Chen, Ming‐Hui; Yu, Zhongdi; Wang, Qunchang; Li, Xiaoxiang; Zhu, Shenglong; Wang, Fuhui

doi:10.1016/j.ceramint.2019.04.232

Cited by 10 publications

(8 citation statements)

References 50 publications

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“…For example, the alkali resistance of enamel coatings can be improved significantly following the mill additives of ZrO 2 and SnO 2 . 8,9 Similar results can be obtained using different mill additives, such as Al 2 O 3 , ZnO, CaO, and SiO 2 . 3,[9][10][11] .…”

Section: Introductionsupporting

confidence: 60%

“…One of the methods involves the optimization of the composition of the coatings by using mill additive as network‐forming agents or corrosion‐resistant components, the introduction of mill additive can potentially result in an increase in the coating density or chemical stability. For example, the alkali resistance of enamel coatings can be improved significantly following the mill additives of ZrO 2 and SnO 2 8,9 . Similar results can be obtained using different mill additives, such as Al 2 O 3 , ZnO, CaO, and SiO 2 3,9–11 …”

Section: Introductionsupporting

confidence: 56%

“…This resulted in the disruption and damage of the network, and the Si–O bonds were broken. The process is shown in the following reaction 8,33–35 :

\begin{equation} \equiv {\rm{Si}} - {\rm{O}} - {\rm{Si}} \equiv + {\rm{ O}}{{\rm{H}}^ - } \to \equiv {\rm{Si}} - {{\rm{O}}^ - } + \equiv {\rm{Si}} - {\rm{OH}}\end{equation}

…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of 316L stainless mill additives on microstructure and alkali corrosive behavior of enamel coatings

Hong

et al. 2023

J Am Ceram Soc.

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Excellent chemical stability, good corrosion resistance, and compositional controllability make vitrified enamel promising coating materials. The corrosion resistance of the [–Si–O–]/[–Si–O–Al–]‐based enamel coatings decreases in alkaline environments, whereas can be improved by incorporating metal oxides, such as ZrO2 and SnO2. The introduction of these oxides results in an increase in the sintering temperature and a decrease in the toughness of the coatings. It was observed that the corrosion resistance of the coatings in an alkaline medium could be improved using metal powder‐based additives without increasing the sintering temperature and affecting the mechanical properties of the coatings. We used powdered 316L stainless steel as the mill additive, and the effects of this additive on the structure and alkali corrosion resistance of the vitrified enamel coatings were studied. Results indicate that the addition of an appropriate quantity of the additive (4 wt.%) improves the extent of gas consumption during the enamel sintering, decreases the degree of porosity and the size of the pores. Furthermore, the mechanical properties of the skeleton formed between the pores could be improved, because blocklike corrosion products are not peeled off, which increases the corrosion resistance of the coatings. The corrosion products, such as Ca‐based compounds, block the corrosion holes, resulting in a decrease in the corrosion rate also.

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Section: Introductionsupporting

confidence: 60%

Section: Introductionsupporting

confidence: 56%

“…This resulted in the disruption and damage of the network, and the Si–O bonds were broken. The process is shown in the following reaction 8,33–35 :

\begin{equation} \equiv {\rm{Si}} - {\rm{O}} - {\rm{Si}} \equiv + {\rm{ O}}{{\rm{H}}^ - } \to \equiv {\rm{Si}} - {{\rm{O}}^ - } + \equiv {\rm{Si}} - {\rm{OH}}\end{equation}

…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of 316L stainless mill additives on microstructure and alkali corrosive behavior of enamel coatings

Hong

et al. 2023

J Am Ceram Soc.

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“…Nanosize nickel particles are good candidates as they perfectly meet the following conditions: they are of small size, have a low oxidation rate at high temperature, and have suitable CTE (about 17.6 × 10 −6 °C −1 ). Our previous study has reported a typical enamel with excellent acid resistance 16,17 . The coefficient of thermal expansion of the enamel is about 9.3 × 10 −6 °C −1 between 25 and 400°C, TG is about 677°C, and dense coating can be prepared at 880°C.…”

Section: Introductionmentioning

confidence: 95%

Thermal shock and sulfuric acid corrosion behavior of enamel–nano‐Ni composite/enamel–nano‐nickel composite coating

Chen

et al. 2020

Int J of Appl Glass Sci

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Dense and well‐adherent enamel–nano‐Ni composite/enamel–nano‐nickel composite coatings were prepared on 304 steel. Their thermal shock (TS) resistance at 400°C as well as the chemical stability in sulfuric acid solution were investigated, and compared with pure enamel coatings. Results indicated that the nanocomposite coatings with 5 wt% of Ni particles exhibited the best resistance to TS. Almost no spalling of the coating occurs after 50 cycles of TS at 400°C. They also provided enough protective effect to the substrates from sulfuric acid corrosion. After 7 days of corrosion, the weight loss of Ni‐5 enamel coating was only 1.107 mg/cm2.

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“…Calcium fluoride (CaF 2 ) crystals have good optical properties, mechanical properties, and chemical stability; therefore, calcium fluoride is widely used [1,2,3,4,5]. Calcium fluoride crystals are very important optical functional crystals, which have the advantages of wide light transmission range, high transmittance, low refractive index, low dispersion, and so on and have become an irreplaceable lens material in ultraviolet lithography objective lens systems [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

Chen

Guo

et al. 2019

Nanomaterials

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In order to reduce the influence of CaF2 addition on the mechanical properties of self-lubricating ceramic tools, we applied a silicon dioxide (SiO2) coating on calcium fluoride (CaF2) nanoparticles through hydrolysis and condensation reactions using the tetraethoxysilane (TEOS) method. The powder was dried by the azeotropic method, so that it acquired a better dispersibility. The resulting composite powders were characterized using XRD (X-ray diffraction) and TEM (transmission electron microscopy), showing that the surface of CaF2 was coated with a layer of uniform and compact SiO2. SiO2 shells with different thicknesses could be obtained by changing the amount of TEOS added, and the thickness of the SiO2 shells could be controlled between 1.5 and 15 nm. At the same time, a ceramic material containing CaF2 nanoparticles and CaF2@SiO2-coated nanoparticles was prepared. It had the best mechanical properties when CaF2@SiO2-coated nanoparticles were added; its flexural strength, fracture toughness, and hardness were 562 ± 28 MPa, 5.51 ± 0.26 MPa·m1/2, and 15.26 ± 0.16 GPa, respectively. Compared with the ceramic tool containing CaF2 nanoparticles, these mechanical properties were increased by 17.57%, 12.67%, and 4.88%, respectively. The addition of CaF2@SiO2-coated nanoparticles greatly improved the antifriction and wear resistance of the ceramic material, and the antifriction and wear resistance were balanced.

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Corrosion of SiO2–B2O3–Al2O3–CaF2-R2O (R=Na and K) enamels with different content of ZrO2 in H2SO4 and NaOH solutions

Cited by 10 publications

References 50 publications

Evaluation of 316L stainless mill additives on microstructure and alkali corrosive behavior of enamel coatings

Evaluation of 316L stainless mill additives on microstructure and alkali corrosive behavior of enamel coatings

Thermal shock and sulfuric acid corrosion behavior of enamel–nano‐Ni composite/enamel–nano‐nickel composite coating

Synthesis of CaF2 Nanoparticles Coated by SiO2 for Improved Al2O3/TiC Self-Lubricating Ceramic Composites

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