As we all know, stainless steel fasteners have excellent corrosion resistance and are the darlings of fasteners in industries such as machinery, construction, aerospace, and medical devices. However, in some application scenarios, an oxidation blackening treatment process is used. Do you know why? Let's explore the advantages of stainless steel oxidation blackening together with IIIBEAR.
Advantages of IIIBEAR Stainless Steel Oxidation Blackening
Our stainless steel oxidation blackening products can undergo customized salt spray testing for 100-1000 hours, ensuring worry-free use. The appearance can be processed into two finishes: bright black and matte black, with a clean surface free of oil stains.
The practical significance of stainless steel oxidation blackening treatment
Although stainless steel itself contains chromium (Cr), which can form a passivation film on the surface to enhance corrosion resistance, in some complex working conditions, the natural protective film still cannot meet the requirements, mainly including the following scenarios:
① Extreme environmental impact: When exposed to high salt spray, high humidity, chemical corrosive media, and high temperatures in the ocean for a long time, the corrosion resistance of stainless steel may gradually decline.
② Friction loss: During assembly, disassembly and long-term vibration of fasteners, the surface passivation film may wear out, thereby reducing their corrosion resistance.
② Friction loss: During assembly, disassembly and long-term vibration of fasteners, the surface passivation film may wear out, thereby reducing their corrosion resistance.
Therefore, stainless steel fasteners are treated with an oxidized blackening surface, which can form a black oxide film (mainly composed of iron (III) oxide Fe₃O₄) on the surface of stainless steel, providing a stable chemical protective layer and effectively enhancing the corrosion resistance, wear resistance and aesthetic appearance of the fasteners.
Application scenarios and advantage comparison
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Product Type
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Application Scenario
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Core Value of Stainless Steel Oxidation Blackening
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Marine Engineering U - type Bolts
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Long - term seawater immersion, salt - fog environment
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Block chloride ion penetration and prevent stress corrosion cracking
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Chemical Equipment Flange Bolts
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Acid - base reaction kettles, corrosive gas environment
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Resist the erosion of corrosive media such as H₂S and CO₂
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Rail Transit Wheel Hub Bolts
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Road sections sprayed with de - icing agents in winter
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Protect threads from corrosion by CaCl₂ and NaCl
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Medical Equipment Adjusting Nuts
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Frequent high - temperature steam sterilization
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Prevent alcohol and disinfectant from pitting the metal
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Aerospace High - temperature Screws
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High - temperature environment above 550°C
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Resist high - temperature oxidation and maintain dimensional stability
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Oxidation and blackening facilitate high-end manufacturing
The oxidation blackening treatment of stainless steel fasteners is not only a surface treatment technology, but also a key means to enhance product performance and industrial application value. With the continuous innovation of technology, the application of this process in fields such as aerospace, Marine engineering, medical devices, and rail transit will become more extensive, providing reliable guarantees for high-end manufacturing.
If you have purchase and customization requirements for stainless steel blackened fasteners or other surface treatment fasteners, please visit https://www.iiibearfastener.com/, we provide professional surface treatment solutions to help upgrade your products!
