Piano Hinge Black Oxide Finish

Piano Hinge Black Oxide Finish generates a black iron oxide film through a chemical oxidation reaction on the steel surface. The thickness is usually only 0.5 to 1.5 microns. This conversion layer gives the hinge a uniform matte appearance and effectively eliminates surface reflections. It is especially suitable for occasions such as photographic equipment boxes, optical instrument cabinets and military equipment that need to avoid light interference. According to the ASTM E139 thermal aging test method, after being exposed to an accelerated aging environment with a relative humidity of 95% and a temperature of 50 degrees Celsius for 168 hours, the color of the blackened film layer has no obvious whitening or discoloration, and the neutral salt spray test is carried out according to ASTM After a seventy-two-hour spray test according to the B117 standard, only a trace amount of white rust but no red rust appeared on the surface of the sample sealed with anti-rust oil, indicating that the treatment has reliable short-term corrosion resistance in general indoor or dry environments. At the same time, the film layer has minimal impact on the size of the hinge, and can maintain the blade thickness tolerance within plus or minus 0.02 mm, without affecting the precise fit of the pin and the blade.

 

 

In terms of wear resistance, although the blackened film layer is thin, it has certain oil storage capacity and resistance to minor scratches. Its surface microhardness is approximately HV 400 to 500 according to the ASTM E384 Vickers hardness test method, which is significantly higher than the HV 180 of untreated steel. A dry friction test was conducted on a standard friction and wear testing machine with a load of 500 grams and a rotation speed of 200 rpm. After 20,000 reciprocations, the film layer did not peel off in a large area, and the corrosion point area of ​​the substrate was less than 3% of the total contact area. In addition, the blackening treatment is usually carried out after the hinge is formed and punched. The treatment temperature is about 140 degrees Celsius, which is lower than the tempering temperature. This avoids blade deformation or hardness reduction. At the same time, the slight alkalinity of the treatment liquid has no impact on the edge distance and hole distance accuracy of the blade. This allows the blackened piano hinge to be used in the maintenance cover of precision instruments and military green equipment. It can not only meet the functional load-bearing requirements, but also meet the dual standards of low reflection and certain rust prevention.

 

 

 

 

---

---

 

 

 

 

 

 

Construct tooling per validated drawings, applying modifications throughout trial production as needed.

 

 

 

Machine early-stage samples and ship them to the customer for approval.

 

 

 

 

Execute production fully aligned with engineering documents and pilot batch specimens.

Upon concluding final inspection, securely pack items and arrange shipment to buyers.

 

 

Secure design papers from customers, or formulate layouts according to their written criteria or supplied physical examples.

Subsequently, both parties must confirm the approved documentation.

 

 

 

 

Present pricing quotations and verify purchase quantities, specifying every aspect such as trading terms,

remittance methods, carton specifications, and additional applicable information.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot Tags: piano hinge black oxide finish, China piano hinge black oxide finish manufacturers, suppliers, factory, 72 Inch Stainless Steel Piano Hinge, Brushed Piano Hinge, Heavy Duty Stainless Continuous Hinge, Mirror Surface Piano Hinge, SS304 Continuous Hinge, Stainless Steel Continuous Hinge