ISO 9001
ISO 14001
IATF16949
ISO 9001
ISO 14001
IATF16949
What is Chemical Pretreatment?
Chemical Pretreatment refers to a series of chemical processes applied to material surfaces to enhance subsequent processing steps, improve adhesion, increase corrosion resistance, and enhance aesthetic appeal. It is an essential preliminary step for processes such as coating, plating, and painting, widely used in the surface treatment of metals, plastics, and other materials.
Chemical Pretreatment Expertise in Yuhui
Chemical pretreatment is essential for improving product quality, extending service life, and enhancing appearance. In many manufacturing processes, it’s a key factor in ensuring the success of subsequent treatments.
Passivation
Phosphating
Ultrasonic Cleaning
Degreasing Cleaning
Passivation
Passivation is a chemical treatment process that creates a protective oxide layer on the surface of metals. It is commonly used for stainless steel, aluminum, and other corrosion-resistant metals to enhance their resistance to oxidation.
Key Features and Benefits
Enhanced Corrosion Resistance: Passivation forms a dense oxide layer on the metal surface, preventing direct contact with air, moisture, and corrosive substances.
No Change in Appearance or Size: This process doesn’t significantly alter the appearance or dimensions, making it ideal for precision applications.
Suitable Materials: Stainless steel and aluminum are frequently passivated to extend their service life.
Phosphating
Phosphating involves creating a phosphate protective film on the metal surface, which improves corrosion resistance and enhances the adhesion of subsequent coatings.
Key Features and Benefits
Improved Corrosion Protection: The phosphate layer acts as a barrier, effectively resisting moisture and salt spray to increase corrosion resistance.
Increased Coating Adhesion: Phosphating roughens the surface, which helps paint or coatings adhere better.
Versatile Application: Phosphating works well for steel, aluminum, and zinc alloys, commonly used in the automotive and appliance industries.
Cost-Effective: This process is efficient and suitable for mass production, providing significant protection at a low cost.
Ultrasonic Cleaning
Ultrasonic cleaning uses high-frequency sound waves to create cavitation bubbles in liquid, effectively cleaning hard-to-reach areas such as complex shapes and grooves.
Key Features and Benefits
Thorough Cleaning: Ultrasonic cleaning efficiently removes oil, oxides, dust, and stubborn residues, even in microscopic holes and grooves.
Eco-Friendly and Efficient: Water-based solvents reduce environmental impact while achieving high cleaning efficacy.
Broad Applications: Suitable for precision parts, electronics, medical devices, and any application requiring high cleanliness standards.
Degreasing Cleaning
Degreasing cleaning is a process to remove oils and contaminants from metal surfaces through chemical or physical methods. This step is crucial in metalworking to ensure reliable results in subsequent processes like plating and painting.
Key Features and Benefits
Effective Oil and Dirt Removal: Degreasing eliminates oils and lubricants from machining, ensuring a clean surface.
Enhanced Subsequent Process Results: A clean metal surface significantly improves adhesion for plating, welding, and painting.
Flexible Methods: Methods include solvent degreasing, thermal degreasing, and ultrasonic degreasing, allowing selection of the most effective approach for specific needs.
Chemical Pre-treatment Department Overview
Our Chemical Pre-treatment Department is dedicated to preparing products for optimal surface coating and further processing. By utilizing a range of advanced chemical treatments, we ensure that all parts are properly cleaned, degreased, and treated to enhance the adhesion of coatings and prevent corrosion. Our services include processes such as phosphating, passivation, ultrasonic cleaning, and degreasing. These treatments improve the longevity and performance of parts while ensuring compliance with environmental standards. With a focus on quality and sustainability, we work diligently to provide superior surface finishes that meet industry standards and customer expectations.
27 +years
Years of experience
2500T
Capable of producing
20000 +㎡
Production Workshop
Small Molded Parts with in Days
Our complete CNC aluminum service will accompany your aluminum machining project from the prototype construction to the end aluminum parts manufacturing.
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Sustainable Development Strategy: Advanced Wastewater Treatment Center
Yuhui has invested $300,000 to upgrade its wastewater treatment facilities. The new system has passed certification by national environmental authorities, meeting and exceeding water pollution discharge standards. Equipped with advanced filtration and recycling technologies, our wastewater treatment center significantly reduces pollutants and optimizes resource efficiency. Through this system, we not only achieve our environmental goals but also make a positive contribution to green manufacturing and sustainable development.
Material
Aluminum Alloy
Aluminum casting offers a lightweight, corrosion-resistant solution with excellent thermal conductivity and recyclability, making it suitable for a wide range of applications.
Aluminum ADC12, ADC6, A360, A380
Zinc Alloy
Zinc alloy casting provides high precision and excellent flowability for intricate designs, along with good corrosion resistance and lower production costs.
Zinc Zamak 3, Zamak 5, Zamak 2, ZA8
Eight Processes
High-accuracy aluminum and zinc alloy parts produced with state-of-the-art die casting machines ranging from 88T to 2000T.
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With machines from 88T to 2000T, we produce high-accuracy aluminum and zinc alloy parts efficiently.
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Over 50 CNC machines, including 3-axis, 4-axis, and 5-axis, deliver precise and efficient machining for complex components.
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A combination of manual and automated deburring techniques ensures smooth, defect-free surfaces for optimal performance.
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Post-casting reshaping and alignment guarantee dimensional accuracy and structural integrity.
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Comprehensive finishing solutions, including powder coating, spray painting, and UV coating, ensure superior durability and aesthetics.
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Global Partner in Die Casting Solutions
Yuhui & Leading Global Automotive Brand: Crafting Precision Steering Valve Solutions
One of the world's leading automotive brands partnered with Yuhui Die Casting to produce high-performance aluminum alloy components for steering valves.
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Yuhui Die Casting joined forces with a major communications equipment manufacturer to produce aluminum alloy heat sinks for communication base stations.
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Yuhui Die Casting collaborated with a leading global medical equipment manufacturer to produce aluminum alloy enclosures for ultrasound machines.
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Spraying in one, fast switching.
The whole machine is equipped with four pressure centrifugal nozzles with adjustable flow rate located under the motor.
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Precise quantitative and uniform spreading
25L bucket, sowing width up to 8m, sowing speed is 30L/min.
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Field transportation saves time and effort
Quick loading and unloading, efficient transportation, regardless of terrain and distance restrictions
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FAQ
Q: What are the main processes included in your chemical pretreatment?
+ -A: Our chemical pretreatment processes include degreasing, pickling, phosphating, passivation, etc., to improve surface cleanliness and adhesion.
Q: Why is chemical pretreatment necessary?
+ -A: Chemical pretreatment removes oil, oxidation layers, and enhances surface activity, providing a solid foundation for subsequent surface treatments (such as spraying or electroplating).
Q: Is your degreasing process environmentally friendly?
+ -A: We use low-VOC environmentally friendly cleaning agents that comply with RoHS and REACH standards, ensuring safety and no pollution.
Q: What is the main function of phosphating treatment?
+ -A: Phosphating improves coating adhesion and enhances corrosion resistance, widely used in industries such as automotive and aerospace.
Q: Does your chemical pretreatment affect the dimensions of the parts?
+ -A: Our chemical treatment thickness is typically controlled within 1-10μm, which does not significantly affect part dimensions.
Q: What is the main function of passivation treatment?
+ -A: Passivation enhances the corrosion resistance of metals, especially suitable for materials like stainless steel and aluminum alloys, extending their service life.
Q: How do you ensure the uniformity of chemical pretreatment?
+ -A: We use automated spraying and immersion processes, combined with strict solution concentration monitoring, to ensure uniform treatment of each part.
Q: What industry standards do your chemical pretreatments comply with?
+ -A: Our chemical pretreatments comply with industry standards such as ISO 9001, and IATF 16949.
Q: Is your chemical pretreatment suitable for aluminum and zinc alloys?
+ -A: Yes, our pretreatment processes can be adjusted for different materials to ensure optimal results.
Q: Can you provide quality inspection reports for chemical pretreatment?
+ -A: Yes, we provide comprehensive reports including solution analysis, adhesion tests, and corrosion resistance tests.
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