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Room-temperature operation eliminates energy-intensive heating requirements and reduces process safety risks.
Non-toxic, chromium-free formulation compliant with RoHS, REACH, and OSHA workplace exposure guidelines.
Forms a dense, uniform black oxide (Fe₃O₄) layer with excellent adhesion and abrasion resistance.
Compatible with automated immersion, spray, and dip-tank systems for high-throughput industrial use.
Minimal wastewater load due to low metal ion content and high bath stability over extended service life.
Aerospace components requiring non-reflective, corrosion-inhibiting finishes on steel and stainless steel parts.
Firearms and tactical equipment where matte black appearance, wear resistance, and electromagnetic signature reduction are critical.
Automotive brake calipers, suspension hardware, and under-hood fasteners exposed to thermal cycling and humidity.
Industrial tooling, jigs, and fixtures needing consistent aesthetic finish and improved lubricity during machining operations.
Military-grade optical mounts and weapon rails requiring MIL-DTL-13924 Class 1A equivalent blackening performance.
| Chemical Type | Alkaline nitrite-nitrate based blackening solution |
| Product Form | Concentrated liquid (ready-to-dilute) |
| Appearance | Clear to pale amber aqueous solution |
| pH (1% aqueous solution) | 12.8 ± 0.3 at 25°C |
| Primary Applications | Black oxide conversion coating on carbon steel, low-alloy steel, and 400-series stainless steel |
| Key Features | No heavy metals (Cr⁶⁺/Ni/Cd), no cyanide, VOC-free, biodegradable accelerator system |
| Benefits | Reduces post-treatment oil sealing requirement; enhances corrosion resistance per ASTM B117 (96–120 hr neutral salt spray on sealed substrates) |
| Regulatory Compliance | REACH SVHC-free, RoHS 2015/863 compliant, EPA Safer Choice qualified (Formulation ID: SC-2023-MB-087) |
| Common Compatible Systems | Suitability |
| Standard alkaline cleaning + rinse + blackening + hot DI water rinse + oil seal line | Highly Recommended – Optimized for single-tank or multi-stage conveyorized lines |
| Ultrasonic pre-cleaning systems (50–65°C) | Recommended – Ensures removal of oils, drawing compounds, and particulates prior to blackening |
| Water-based rust inhibitors (e.g., VCI emulsions) | Suitable – Compatible with post-blackening sealing; no adverse interaction observed |
| Electroless nickel plating pre-treatment baths | Suitable – May be used as final finish on Ni-P coated carbon steel where matte aesthetics are required |
Q1: What is the CAS Registry Number for this blackening agent?
A: The primary active formulation is registered under CAS No. 1310-73-2 (sodium hydroxide base component); full proprietary blend has confidential CAS status per 40 CFR §720.30(e). SDS Section 3 provides complete ingredient disclosure.
Q2: What is the recommended working concentration and typical immersion time?
A: Dilute 1:9 with deionized water (10% v/v); immersion time ranges from 3–10 minutes at 20–25°C depending on substrate composition and desired oxide thickness (measured via reflectance or weight gain per ASTM D1730).
Q3: How does this product compare to traditional hot black oxide (e.g., MIL-DTL-13924) in terms of corrosion resistance and dimensional stability?
A: While hot oxide yields thicker Fe₃O₄ layers (1–1.5 µm), this ambient blackening achieves 0.5–0.8 µm with comparable salt-spray performance when paired with hydrophobic sealers; zero dimensional change occurs—ideal for precision-ground components where tolerance retention is mandatory.
Q4: Are there extractable substances or migration concerns when used on parts contacting food or pharmaceutical processing environments?
A: No leachable heavy metals or restricted organics detected per FDA 21 CFR 175.300 and USP <661.1> testing; certified for incidental food contact when sealed with NSF H1-approved oils. Migration studies show <0.01 ppm total extractables in aqueous simulants (22°C, 24 hr).
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
