What Are the Regulations for Surface Treatment Technologies of Titanium Alloy Castings?
Sep 10, 2025
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The regulations for surface treatment technologies of titanium alloy castings are primarily based on the national standard "Specification for Surface Treatment Technologies of Titanium and Titanium Alloy Castings" (GB/T 39330-2020). This standard specifies the surface treatment, quality inspection, quality control, and technical safety requirements for titanium and titanium alloy castings. Below are some key regulations for surface treatment technologies of titanium alloy castings:
Surface Treatment Methods
Sandblasting
Purpose: Remove adhered sand, surface sintered layers, and partial oxide layers from the casting surface to prepare for subsequent treatments such as acid washing or electroplating.
Requirements: Sandblasting typically uses white corundum for coarse blasting. The blasting pressure should be controlled below 0.45 MPa to prevent intense sparks from sand particles impacting the titanium surface, which could cause temperature rise and reactions with the titanium surface, leading to secondary contamination.
Acid Washing
Purpose: Quickly and thoroughly remove reaction layers such as oxide layers and other contaminants from the casting surface while avoiding contamination by other elements.
Requirements: Commonly used acid washing solutions include HF-HCl and HF-HNO3 systems. The HF-HCl system has a higher hydrogen absorption capacity, while the HF-HNO3 system has lower hydrogen absorption and can achieve a bright surface finish. The concentration of the acid washing solution (e.g., HF concentration at 3%–5%, HNO3 concentration at 15%–30%) and temperature (generally 20–25°C) must be controlled during acid washing. The acid washing time is approximately 3–5 minutes. After acid washing, the castings must be thoroughly rinsed in water and dried in a hot air stream.
Other Methods
Surface treatment of titanium alloy castings may also include advanced techniques such as electrolytic mechanical composite grinding, barrel grinding, chemical polishing, and electrolytic polishing. These methods can further reduce surface roughness and improve surface glossiness but are relatively complex and suitable for applications with extremely high surface quality requirements.
Quality Inspection and Control
Purpose: Ensure the quality of titanium alloy castings after surface treatment meets standard requirements.
Requirements: Conduct strict quality inspections on castings after surface treatment, including appearance checks, dimensional accuracy checks, and surface roughness checks. Additionally, a quality control system should be established to monitor all aspects of the surface treatment process, ensuring the stability and consistency of process parameters.
Technical Safety
Requirements: During the surface treatment of titanium alloy castings, safety operating procedures must be strictly followed, and necessary protective equipment such as safety goggles, protective clothing, and gloves must be worn. Additionally, the integrity of processing equipment and tools should be ensured to prevent safety accidents caused by equipment failures or improper operations.
Titanium product forms available from GNEE
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Item Name |
china wholesale stock astm b337 b338 gr1 gr2 gr9 titanium pipe titanium tubes seamless |
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Material |
pure titanium and titanium alloy |
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Standard |
ASTM B337, ASTM B338. ASTM B861, ASTM B862 |
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Brand |
China Grades: TA1, TA2, TC4 (Gr5 Equivalent), TA9 (Gr7 Equivalent), TA10 (Gr9 Equivalent), TA18 |
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Shape |
Round Titanium Tube/Pipe, Square Titanium Tube/Pipe, Rectangular Titanium Tube/Pipe, Titanium Coil Tube |
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Type |
Seamless & Welded (ASTM B337/B338 for Industrial & Heat Exchanger Applications) |
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Product name |
Pure Titanium bar/Pure Titanium rod/Titanium alloy bar/Tianium alloy rod |
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Standard |
GB/T 2965-2007 GB/T 13810-2007, ASTM B348,ASTM F67,ASTM F136, AMS4928,MIL4911 |
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Titanium type |
Commercially Pure(CP) / Titanium alloy |
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Grade |
TA1 TA2 TA3 TA4 TA5 TA6 TA7 TA8 TA9 TA10 TA11 TA12 TA13 TA14 |
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Diameter |
3-350mm |
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Length |
Max6000mm |
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Technique |
Forging, machining |
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Surface |
Acid surface or polishing, sand blasted surface |
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Shape |
Round, flat, square, hexagonal |
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Application |
Metallurgy, electronics, medical, chemical, petroleum, pharmaceutical, aerospace, etc. |
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Production Name |
Titanium plate/Titanium sheet |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Product name |
Titanium wire |
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Grade |
GR1,GR2,GR3,GR4,GR5,GR7,GR9,GR11,GR12,GR23 etc.
ERTi-1, ERTi-2, ERTi-3, ERTi-4, ERTi-5, ERTi-7, ERTi-9, ERTi-11, ERTi-12 |
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Size |
Dia：0.1-8mm or customizable |
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Standard |
ASTM B348,ASME SB348,ASTM B863,AWS.A5.16,GB/T3623-2007 |
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MOQ |
10kg |
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Quality and test |
Annealing, Ultrasonic testing |
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Application |
Aerospace, Chemical, Medical, Eye Frames,Welding etc |
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Feature |
High strength,Light weight,Excellent heat conduction and corrosion resistance |
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Condition |
Annealed (M), Hot Worked (R), Cold Worked (Y) |
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Surface |
Bright, Polished, Pickling, Sandblasting |
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Package |
Wooden Box |
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Product Name
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Custom Precision CNC Machining Services
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Material
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Metal: Aluminum, Stainless Steel, Copper, Iron, Titanium Alloy, Zinc Alloy, Magnesium Alloy.
Plastic: Nylon, ABS, POM, PC, PP, PE, PETG, PEEK, PMMA, PVC, UHMW.
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Surface treatment
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Anodizing, Polishing, Electroplating, Powder Coating, Sandblasting, Magnetic Polishing, Spray Painting, Drawing, Embossing, Electrophoresis, Screen Printing, Laser Engraving.
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Process
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3-Axis/4-Axis/5-Axis/6-Axis CNC Milling, CNC Turning
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Application
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Mechanical Spare Parts, Aerospace Components, Automotive Parts, Maintenance Parts
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Maximal Part Size
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3000 mm (118 in)
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Minimal Part Size
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2 mm (0.08 in)
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Drawing format
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DWG, DXF, PDF, SOLIDWORKS, PRT, STP, STEP, IGS, etc.
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Certification
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ISO 9001:2015
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GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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