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Barium chromate powder is an inorganic compound, also known as ultramarine yellow, CAS 10294-40-3, Molecular formula BaCrO4, yellow heavy monoclinic crystalline powder, dissolved or decomposed in inorganic acids. Insoluble in water, dilute acetic acid, and chromic acid solutions. Heating is flammable, the flame is green, and above 900 ℃, it decomposes into BaCr2O4 and Ba3Cr2O6. Can be used to determine sulfates or selenates. It cannot be used as a coloring pigment because it contains chromate ions, so it has a similar effect to zinc chromium yellow when used in anti rust paints. Barium potassium chromate cannot be used as a coloring pigment, it can only be used as an anti rust pigment and can replace some zinc yellow. From the perspective of development trends, it is only one of the varieties of chromate anti rust pigments available for selection in the coating industry. On October 27, 2017, the International Agency for Research on Cancer (IARC) of the World Health Organization released a preliminary list of carcinogens, with chromium (VI) compounds listed as Group 1 carcinogens.
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Chemical Formula |
BaCrO4 |
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Exact Mass |
253 |
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Molecular Weight |
254 |
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m/z |
254 (100.0%), 253 (15.7%), 255 (11.3%), 252 (11.0%), 251 (9.2%), 252 (5.2%), 250 (3.4%), 256 (2.8%), 254 (1.8%), 253 (1.2%), 252 (1.0%) |
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Elemental Analysis |
Ba, 54.21; Cr, 20.53; O, 25.26 |
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Barium chromate powder is an inorganic compound with the chemical formula BaCrO4. It is a yellow crystalline powder that is insoluble in water, flammable when heated, and has a green flame. It decomposes into BaCr2O4 and Ba3Cr2O6 at temperatures above 900 ℃. As a multifunctional chemical substance, barium chromate has a wide range of applications in various fields.
Usage of pigments
Although barium chromate itself cannot be used as a coloring pigment, it has a similar effect to zinc chrome yellow in anti rust paint. Zinc chromium yellow is a commonly used anti rust pigment, and barium potassium chromate can also be used as an anti rust pigment, which can replace some zinc yellow. From the perspective of development trends, barium chromate is only one of the varieties of chromate anti rust pigments available for use in the coating industry. This application is mainly due to the chemical stability of barium chromate and its ability to form an effective rust barrier, protecting the metal surface from corrosion.
Application of paint
In the field of coatings and paints, barium chromate is widely used in the production of advanced coatings and industrial paints due to its excellent antioxidant and anti-corrosion properties. As one of the core raw materials, barium chromate can significantly improve the durability and adhesion of coatings. This performance makes coatings containing barium chromate particularly suitable for fields that require extremely high product quality, such as aviation and automotive manufacturing. In these fields, the performance and lifespan of coatings are crucial, and the addition of barium chromate helps ensure that coatings can maintain their protective and aesthetic properties for a long time. In addition, barium chromate is also used as a component of pigments in certain special scenarios, providing stable and vivid color expression for coating products.
Ceramic Applications
In the field of ceramics, barium chromate is mainly used as a coloring agent or additive for ceramics. By adding barium chromate, ceramic products can achieve richer colors and better quality. This application makes ceramic products more visually appealing and meets consumers' demand for high-quality ceramic products. Meanwhile, the introduction of barium chromate also helps improve the weather resistance and durability of ceramic products, extending their service life.
Glass usage
In glass manufacturing, barium chromate is used as a clarifying agent, which has the effects of increasing gloss and defoaming. This application enables glass products to more effectively remove bubbles and impurities during the production process, resulting in a clearer and more transparent effect. Meanwhile, the introduction of barium chromate also helps to improve the chemical stability and mechanical properties of glass products, enhancing their durability and safety.
Application of chemical reagents
As a chemical reagent, barium chromate powder has a wide range of applications in the field of chemical analysis. Due to its high purity and low impurity content, barium chromate has become an ideal choice for laboratory and industrial users. Barium chromate plays a crucial role in the quantitative determination of sulfates and selenates. Its excellent chemical stability and reactivity make the measurement results more accurate and reliable. In addition, barium chromate is also used as a catalyst or additive for other chemical reactions, promoting the progress of the reaction and improving the yield and purity of the product.
Other uses
In addition to the above-mentioned fields, barium chromate is also used as a raw material and filler for rubber, plastics, papermaking, textiles, paints, inks, and welding rods. In the rubber and plastic industry, the addition of barium chromate can improve the weather resistance and durability of products; In the paper and textile industries, barium chromate is used as a filler and reinforcing agent to improve product quality and performance. In addition, barium chromate is also used as a raw material for barium based lubricants, oil refining, sugar beet production, artificial silk, as well as insecticides, disinfectants, rodenticides, explosives, green fireworks, signal flares, tracer flares, and indicators for medical X-ray imaging. These applications further demonstrate the multifunctionality and wide application value of barium chromate.
Specific application examples
Application examples in coatings:
Automobile manufacturing: In the process of automobile manufacturing, spraying coatings containing barium chromate on the body of the car can significantly improve its corrosion resistance and aesthetics. This coating can maintain its luster and color for a long time, meeting consumers' demand for high-quality cars.
Aviation manufacturing: In the field of aviation manufacturing, coatings containing barium chromate are widely used for the coating of aircraft shells and internal structures. This coating not only provides effective anti-corrosion protection, but also meets the requirements of aircraft for lightweight and high-performance.
Application examples in ceramics:
Art ceramics: In the production process of art ceramics, adding colorants such as barium chromate can create more diverse and colorful artistic effects. These ceramic products not only have ornamental value, but also have certain collection value.
Architectural ceramics: In the field of architectural ceramics, the addition of barium chromate can improve the weather resistance and durability of ceramic products. This type of ceramic product is widely used for decoration of building exterior walls, floors, and other parts, meeting consumers' demand for high-quality building decoration materials.
Application examples in glass:
Optical glass: Adding clarifying agents such as barium chromate during the manufacturing process of optical glass can significantly improve the optical properties of the glass. This type of glass is widely used in the manufacturing of optical instruments such as eyeglass lenses and telescopes, meeting consumers' demand for high-quality optical products.
Architectural glass: In the field of architectural glass, glass products containing barium chromate have better transparency and glossiness. This type of glass is widely used in the decoration of building curtain walls, doors and windows, and other parts, enhancing the overall aesthetics and value of the building.
Application examples in chemical reagents:
Sulfate determination: In chemical analysis, barium chromate is used as a reagent to quantitatively determine sulfate. By controlling the reaction conditions and measuring the amount of reaction products, the content of sulfate in the sample can be accurately determined.
Selenate determination: Similarly, barium chromate powder can also be used for quantitative determination of selenate. This measurement method has a wide range of applications in environmental monitoring, food safety, and other fields, providing strong support for scientific research and technological applications in related fields.
Coloring agent
Barium chromate is primarily used as a yellow colorant in ceramic coloring. Its application characteristics and precautions are as follows:
► Application Characteristics
1) Color Performance
Barium chromate is a yellow crystalline powder that imparts a bright yellow appearance to ceramic products. It is commonly used in ceramics requiring yellow decoration or base colors, such as yellow-glazed porcelain and painted ceramics.
2) Chemical Stability
Barium chromate is insoluble in water but soluble in hydrochloric acid and nitric acid. This property ensures it maintains a stable yellow hue in ceramic glazes, resisting fading or discoloration due to environmental humidity changes.
3) Synergistic Effects with Other Colorants
In ceramic glazes, barium chromate can be combined with other colorants (such as iron oxide, cobalt oxide, etc.). By adjusting the formulation ratios, a wide range of hues can be achieved-from light yellow to deep yellow and yellow-green-meeting diverse design requirements.
► Application Scenarios
1) Daily Ceramics
Used for underglaze or in-glaze decoration on tableware, tea sets, and other daily ceramics, enhancing product aesthetics and market competitiveness.
2) Art Ceramics
In ceramic sculptures, murals, and other artistic works, barium chromate serves as a yellow colorant to amplify visual impact and accentuate thematic colors.
3) Architectural Ceramics
Used for coloring building ceramics like tiles and mosaics. When combined with other colors, it creates rich decorative effects, enhancing the aesthetic appeal of architectural spaces.
► Precautions
1) Safety
Barium chromate contains hexavalent chromium (Cr⁶⁺), which is carcinogenic. Inhalation or skin contact may pose health risks. Therefore, strict adherence to safety protocols is essential during ceramic production. Wear protective clothing, gloves, and goggles to avoid direct contact with barium chromate powder.
2) Waste Disposal
Barium chromate and its waste must be treated as hazardous waste. Prevent release into the environment to avoid long-term toxic effects on aquatic life. Ceramic manufacturers should establish comprehensive waste management systems to ensure safe and compliant disposal.
3) Exploring Alternative Solutions
With heightened environmental awareness, the ceramics industry is progressively exploring alternatives to barium chromate. Examples include developing chromium-free yellow colorants or adopting other eco-friendly coloring technologies to reduce environmental risks during production.
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The chemical formula of Barium Chromate Powder is BaCrO₄, composed of barium ions (Ba²⁺) and chromate ions (CrO₄²⁻), belonging to the orthorhombic crystal system and presenting as yellow crystalline powder. Its molecular weight is 253.32 g/mol, with a density of 4.49-4.50 g/cm³, and a melting point of 210℃ (decomposition temperature).
As a strong oxidizing agent, Barium Chromate Powder may cause intense reactions or even explosions when heated at high temperatures or in contact with reducing agents.
When heated above 210℃, it undergoes thermal decomposition, generating barium oxide (BaO) and trichloride of chromium (Cr₂O₃), and releasing oxygen.
When reacting with strong acids (such as hydrochloric acid, sulfuric acid), it dissolves and forms corresponding barium salts and chromium salts, while releasing toxic gases.
It is insoluble in water (with a solubility of 0.2775 mg/100 mL at 20℃), but soluble in strong acids.
It is almost insoluble in organic solvents and has stable chemical properties. However, it should be avoided from contact with reducing substances, organic compounds, or flammable materials to prevent potential hazards.
High toxicity: Contains hexavalent chromium (Cr⁶⁺), which has strong carcinogenicity and mutagenicity. It can enter the human body through inhalation, ingestion, or skin contact, and long-term exposure may lead to lung cancer, skin ulcers, and nasal septum perforation.
Environmental hazards: Highly toxic to aquatic organisms and has long-term persistent effects. Strict compliance with hazardous chemical management regulations is required.
Safety labels: GHS classification as an oxidizing solid (category 2), acute toxicity (oral/inhalation category 4), skin sensitization (category 1), carcinogenicity (category 1B), etc., with the warning word "Danger".
In the field of pigments: Utilizing its stable yellow crystalline structure, it provides long-lasting color and corrosion resistance, but the release of chromate ions needs to be controlled to reduce environmental risks.
In anti-rust coatings: By forming a passivation film to inhibit metal corrosion, but a balance must be struck between anti-rust performance and toxicity control.
Safety matching and pyrotechnic products: As an oxidizer, it provides oxygen support for combustion, and strict control of storage conditions is required to prevent accidental ignition.
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