What is Sulfuric Acid Anodizing?

Sulfuric acid anodizing is the most widely used anodizing method for aluminum and its alloys. The process thickens the natural oxide layer on the metal’s surface through an electrochemical reaction, enhancing its corrosion resistance, appearance, and durability.

This method is especially effective for parts that must withstand harsh environments or require secondary finishes. Del’s Plating offers Type II sulfuric anodizing in a variety of colors, including clear, black, gold, red, blue, and more.

Our Process: Built for Quality and Efficiency

Every anodizing project at Del’s Plating begins with a technical review to assess part geometry, alloy compatibility, masking requirements, and finish expectations. We then apply a tailored sulfuric anodizing process to create uniform coatings with tight thickness tolerances.

Once anodized, parts may receive sealing treatments or secondary finishes depending on your application needs. Throughout each step, our technicians monitor parameters like bath temperature, current density, and dwell time to ensure reliable, high-quality outcomes.

We maintain detailed records and provide full documentation upon request to support your traceability and compliance requirements.

Specifications:

MIL-A-8625F
MIL-PRF-8625

Colors:

Black
Clear
Gold
Green
Blue
Red

MIL-A-8625, MIL-PRF-8625 Type II: Sulfuric Acid Anodizing

Base Materials that MIL-A-8625 anodize type II sulfuric anodizing can be applied include 1100, 2000, 3000, 5000, 6000, and 7000 series aluminum alloys.

Class 1: Specifies that there will be no dye applied to the finished part
Class 2: Specifies that there will be a dye applied to the finished part

Why Choose Del's Plating for Sulfuric Anodizing?

Del’s Plating combines industry expertise with advanced equipment to deliver highly repeatable anodizing results that meet MIL-A-8625 specifications. Our team works closely with each customer to ensure part compatibility, optimal finish, and regulatory compliance.

Benefits of partnering with Del’s Plating for your sulfuric anodizing services include:

Certified processes that meet or exceed military and aerospace standards
Multiple color options and consistent surface finishes
In-house quality control lab for precise measurement and verification
Support for high-mix and high-volume production
Fast turnaround from our weekday 24/7 operating facility

We’re more than a service provider—we’re a reliable extension of your manufacturing operation.

Industries That Rely on Sulfuric Anodizing

Del’s Plating serves OEMs and suppliers across industries where durability, performance, and specification compliance are critical. If your components must endure wear, moisture, or chemical exposure, our sulfuric acid anodizing can meet the challenge.

Industries we serve include:

Aerospace & Defense – for structural components, housings, and mounting systems
Oil & Gas – to protect components in extreme environments
Medical Devices – for surgical instruments and implantable parts
Semiconductor Manufacturing – to meet stringent cleanliness and performance standards

We also work with general manufacturers producing high-precision aluminum components that require consistent finishes and protective coatings.

Request a Quote for Sulfuric Anodizing Services

Whether you're looking to outsource a high-volume project or need a dependable partner for ongoing production, Del’s Plating is equipped to deliver superior sulfuric anodizing services with precision and speed. Our responsive team can assist with quotes, technical questions, and material planning.

Contact us today to learn how our Type II sulfuric acid anodizing can improve the performance, lifespan, and aesthetics of your aluminum parts.

Request a Quote

MIL-SPEC Coatings

We provide metal finishing services for most MIL-SPEC coatings. All finished parts are inspected by our quality control center to make sure the highest standards are met.

see mil-spec list