Armoloy Specifications
Armoloy Specifications
ASTM B650
Electrodeposited Engineering Chromium Coatings on Ferrous Substrates
Armoloy Specifications
What is ASTM B650?
ASTM B650 is a standard specification for engineering-grade hard chromium coatings applied to ferrous alloy surfaces through electrodeposition. Unlike decorative chrome, these coatings are thicker and designed for durability, making them ideal for improving wear resistance, reducing friction, protecting against corrosion, and restoring undersized or worn parts.
The standard classifies coatings into two thickness categories:
Class 1: 2.5 to 25 µm for light-duty applications.
Class 2: Greater than 25 µm for heavy-duty applications.
ASTM B650 creates a structured approach to hard chromium plating, ensuring every coating meets exact engineering requirements, regardless of application. By regulating thickness, adhesion, and performance characteristics, ASTM B650 eliminates guesswork and gives manufacturers confidence in every plated component.
Beyond quality control, ASTM B650 also integrates safety and environmental considerations, aligning plating operations with industry best practices. For applications where failure isn’t an option—like oil and gas extraction, injection molding, and hydraulic pumps—this standard ensures components perform reliably under extreme conditions.
The Role of ASTM B650 in Electrodeposited Engineering Chromium
ASTM B650 contributes to hard chromium plating in several key ways:
- Supports High-Precision Applications: Class 1 coatings down to 2.5 µm are ideal for parts that require tight tolerances and smooth movement.
- Simplifies Part Repair and Rebuilds: Standardized thickness and adhesion criteria help restore worn or undersized components to spec.
- Standardizes Processes: Establishes uniform testing and application methods, helping engineers and finishers achieve consistent results.
- Mitigates Safety Risks: Requires post-plating heat treatments to reduce hydrogen embrittlement in high-strength steel parts.
Engineers and finishers rely on ASTM B650 to produce durable, high-quality hard chrome coatings for demanding industries.
ASTM B650 Testing Methodology & Results
ASTM B650 outlines strict testing methods to verify hard chromium coatings’ strength, reliability, and consistency. Key tests include:
- Thickness Measurement: Uses methods like microscopy, magnetic testing, coulometry, and X-ray spectrometry to confirm coatings meet Class 1 or Class 2 thickness standards.
- Adhesion Testing: Bend, file, push, and heat-quench tests check that coatings stay bonded to the surface without peeling, flaking, or delaminating.
- Porosity and Corrosion Testing: Ferroxyl, salt spray, and copper sulfate tests help identify tiny pores or defects that can lead to corrosion.
- Hydrogen Embrittlement Prevention: Pre-plating heat treatments reduce residual stress, while post-plating baking strengthens high-strength steels and prevents brittleness.
These tests simulate real-world challenges so coatings perform as expected where it matters most.
Industries that Rely on ASTM B650
ASTM B650 is critical in industries that demand precision, strength, and long-lasting protection for ferrous components. These coatings are essential in:
- Aerospace: Reduces friction and enhances wear resistance in landing gear, engine parts, and hydraulic systems.
- Automotive: Increases durability in piston rings, brake rotors, and transmission components, improving performance and reducing maintenance.
- Machined Components: Provides precise, wear-resistant coatings to extend the life of high-precision industrial parts.
- Oil and Gas: Protects drilling tools, pipelines, and valves from corrosion and wear in harsh environments.
- Injection Molds: Strengthens molds, dies, and cutting tools, maintaining precision in high-stress manufacturing settings.
From hydraulics to high-speed tooling, manufacturers in these sectors rely on ASTM B650 for consistent plating, part protection, and operational efficiency.
Benefits of Working with an ASTM B650 Provider
Turnkey Partnership
Work with experts who guide you through the entire process, from material selection to final delivery, ensuring seamless project execution
Durable Coating Solutions
Compliant coatings deliver exceptional wear and abrasion resistance, extending component life and reducing replacements
Performance Optimization
Enhance equipment functionality with coatings that minimize friction, galling, and corrosion
Predictable Maintenance
High-quality coatings reduce unexpected failures, making maintenance more predictable and cost-effective
Regulatory Confidence
ASTM B650 providers support compliance with industry regulations worldwide
Precision Restoration
Restore undersized or worn parts with coatings that meet stringent engineering requirements, reducing material waste
Consistent Quality
Standardized plating processes ensure repeatable, high-performance coatings across every batch
Risk Mitigation
Comprehensive testing verifies that coatings meet strict quality standards, minimizing the chance of failures
Specifications at Armoloy
Armoloy offers plating solutions that meet ASTM B650 to support both regulatory compliance and individual project needs. Explore common specifications and accreditations we work with, and contact us to find the right solution for your application.
Disclaimer: The interpretations and overviews of ASTM B650 provided by The Armoloy Corporation are solely the views of Armoloy and may not represent the views of other entities. These interpretations are intended for informational purposes only and should not be considered as definitive or legally binding. The Armoloy Corporation is not responsible for the accuracy of these interpretations and expressly disclaims any liability for loss or damage arising from their use. This disclaimer is subject to change and does not create any express or implied warranty regarding the information provided.