• Steel use environment and corrosion conditions
    Steel use environment and corrosion conditions

    2019-08-01

    The steel is subjected to different degrees of corrosion conditions in different operating environments. According to the corrosion conditions, the environmental conditions used by the steel are divided into four grades: Steel use environment and corrosion conditions Steel use environment and corrosion conditions Definition Performance Requirements Coating Effect Harsh conditions Products used in seawater or marine environments, as well as products that are used in chemical areas and other highly polluting industrial areas or that are exposed to chemicals for extended periods of time. Coatings used in this very harsh environment are called heavy-duty coatings, such as marine coatings, chemical anti-corrosion, etc. Requires coatings to have excellent corrosion resistance Usually the primer pays attention to rust prevention ,the middle coating and the top coating focus on the shielding effect, and the entire coating system layer and layer complement each other to strengthen the shielding and anti-corrosion effect of the whole system. Medium conditions Areas with more annual rainfall, high air humidity, and closer to industrial pollution areas and coasts (within 3km) The coating film is required to be in contact with water or an aqueous solution for a long time, and the environment in which the coating is used is harsh. Any of three kinds of anti-corrosion effects of physical shielding, corrosion inhibition and electrochemistry can be employed. Corrosion inhibition is usually used as an anti-corrosion method under moderately harsh conditions, such as automotive coatings. Mild condition Often exposed to water, indoor use environments that require rinsing, such as kitchens, bathrooms, and indoors with a certain source of pollution. Coatings for washing machines and refrigerators are coatings for steel under mild conditions Good water immersion resistance, wet adhesion, scratch resistance, impact resistance, etc., which can impair the protective properties of the coating film Relying on physical shielding methods to prevent rust can meet the requirements and compare Emergency mild condition Used in dry and warm indoors without any polluted environment, such as paints used in general household appliances and toys High decorative, gloss retention, abrasion resistance, scratch resistance, in some cases the decorative requirements of the coating are more important than the chemical resistance, the damage to the appearance of the coating film can not be accepted Relying on physical shielding methods to prevent rust can meet the requirements and compare Sinograce chemical produces anticorrosive coating and anti rust coating for metal surfaces. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

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  • Characteristics of metal materials and their effects on coatings
    Characteristics of metal materials and their effects on coatings

    2019-07-31

    Metal materials (such as steel) are chemically active, and the surface is exposed to water, oxygen, and various acid, alkali, and salt electrolyte ions, which may cause oxidative corrosion, electrochemical corrosion, etc., causing steel corrosion, and the volume of iron oxide generated by steel corrosion is easy to fall off. , causing damage to the steel structure.The coating selected for the coating of steel and metal products depends on the structure and composition of the product itself and the environment in which the product will be used in the future, and also depends on factors such as the user's appearance and service life requirements.There are many kinds of coatings that can be used on steel surfaces. According to steel products, there are marine coatings, automotive coatings, light industrial coatings, etc.; according to the main effects of coatings, there are anti-rust coatings, chemical corrosion-resistant coatings, decorative coatings, etc. For the surface coating of steel metal substrates, poor impermeability and poor adhesion of the coating film are serious defects. The defects such as pores, pinholes, shrinkage cavities, cracks, etc. of the coating film itself are channels through which steel corrosion medium (water, oxygen, electrolyte ions) penetrates, and these channels reduce the impermeability of the coating film.When the oxygen and electrolyte ions are dissolved in water, they will travel through the coating film with the liquid water. When designing anti-corrosion coatings, the wet adhesion is considered as the primary condition in terms of mechanical properties. The protective life of the paint film is inferred by wet adhesion. Some people say that if there is sufficient wet adhesion, the protection of the coating is indefinite.Therefore, it can be said that factors affecting the wet and dry adhesion of the coating film accelerate the expansion of the rust and increase the corrosion. Therefore, the coating with poor wet adhesion of the coating film cannot be coated before it is improved, so as to avoid causing more waste. Sinograce chemical produces anticorrosive coating and anti rust coating for metal surfaces. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

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  • Wood coating process
    Wood coating process

    2019-07-30

    Wood coating process 1.There are many large holes in the hard wood, putty or hole adding agent to flatten; 2.Apply closing primer after hole filling; 3.If you need to deepen the surface texture of the wood and highlight the wood grain, you can apply the closed primer and apply the water color; 4.After conditioning the wood grain, apply two closed primer; 5.Finish with top coat. Sinograce Chemical company has professional technical guidance on coatings. We have polyurethane solutions, acrylic emulsions, wood coatings, and various additives such as leveling agents, defoamers, etc. Sinograce Chemical is professional technical enterprise providing solutions of surface materials and manufacturing of raw materials. Sinograce chemical produces waterborne wood paint coating, as well as top and bottom coatings, and chemical additives. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

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  • Effect of wood substrate on coatings
    Effect of wood substrate on coatings

    2019-07-29

    Due to the chemical composition of the wood and the particularity of the wood fiber, if it is not handled properly, the water-based paint film will be damaged. Wood is composed of cellulose and a small amount of gum, resin (rosin), pigment, tannin and the like. Although the amount of gum, resin, pigment, tannin, etc. is small, it has a large negative impact on the properties of the coating (mainly film forming and durability), it will affect the adhesion of the coating, if the upward osmosis It also affects the appearance of the film. Wood fiber is hydrophilic, moisture absorption is easy to expand, and drying shrinkage is easy to cause cracking. Wood is prone to cracking and deformation during continuous moisture absorption and drying. Therefore, the wood should be dried before painting to control its water content to suit the local climate to avoid hygroscopic expansion in humid climates or dry shrinkage in dry climates. The moisture content of wood used as building materials or for outdoor use is controlled between 14% and 22%, and for furniture or indoor structures is controlled at around 12%. If the wood topcoat is not hydrophobic, the water will penetrate into the coating film during the coating and use process. If it is light, the appearance of the decorative article will be black and white, and the heavy one will intensify the expansion deformation and mold of the wood fiber,rot. In the process of wood coating, because the wood is a dense and uneven substrate,If the primer is poorly sealed, the solvent and the base material in the topcoat are not uniformly permeable, which may cause the gloss of the topcoat to be uneven and lose light, resulting in poor gloss stability. For the floating color coating, because the penetration is not uniform, the drying rate of the coating film is different, which causes the color to appear uneven. Cork primer glass vitrification is too high, the coating film is too hard and lacks deformation ability, and it is not suitable for the deformation of wood fiber, which will cause cracking and wrinkling of the topcoat. Hard wood has a tight texture and is not prone to expansion and contraction, so coatings used on hardwoods do not necessarily require good flexibility. Sinograce chemical produces waterborne wood paint coating, as well as top and bottom coatings, and chemical additives. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

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