Sulfuric Acid Concentration in Type II Anodizing Baths: Process Parameters
Author: Walmir Rezende • 07/30/2026
How sulfuric acid concentration, bath temperature and input purity affect the quality of the anodic layer in Type II anodizing.
Read MoreMetalworking Industry
Technical articles on metalworking industry
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Regenerating Spent Sulfuric Acid from Pickling: Recovery vs. Disposal
Walmir Rezende • 07/29/2026
Learn when it makes sense to regenerate spent sulfuric acid from pickling and when disposal with neutralization is the more viable option.
Read MoreSulfuric Acid for Carbon Steel Pickling: Concentration, Temperature and Bath Life
Walmir Rezende • 07/29/2026
How the concentration and temperature of a sulfuric acid bath affect mill scale removal on carbon steel, and what shortens the life of the solution.
Read MoreLot Traceability under ISO 9001 and IATF 16949: A Practical Guide for the Metalworking Industry
Walmir Rezende • 10/30/2025
A complete guide to chemical input lot traceability under ISO 9001:2015 and IATF 16949:2016: meet audit requirements with COAs, documentation and supplier control.
Read MoreTranscribed COA vs In-House Testing: The Chemical Distributor's Role in Metalworking Traceability
Walmir Rezende • 10/29/2025
Learn the difference between a transcribed COA and in-house testing by chemical distributors: transparency, traceability and manufacturer approval criteria in the metalworking industry.
Read MoreAcid COAs for the Metalworking Industry: Critical Parameters and Supplier Validation
Walmir Rezende • 10/28/2025
Learn how to read the critical parameters in Certificates of Analysis (COA) for industrial acids: objective criteria to validate suppliers and secure ISO 9001 traceability.
Read MoreCertificate of Analysis (COA) in the Metalworking Industry: Traceability and ISO 9001 Compliance
Walmir Rezende • 10/27/2025
Why the Certificate of Analysis (COA) matters for chemical input traceability in the metalworking industry: ISO 9001 and IATF 16949 compliance and supplier qualification.
Read MorePickling Bath Saturation: How to Identify and Correct It
Walmir Rezende • 10/26/2025
Progressive saturation of acid baths is a common problem in foundry pickling. Learn to spot the signs and correct them in time to avoid production losses.
Read MorePickling Wastewater Neutralization: A Complete CONAMA 430 Protocol
Walmir Rezende • 10/26/2025
Improper disposal of acidic pickling wastewater is a common cause of environmental fines at foundries. See the neutralization protocol that meets CONAMA 430.
Read MoreHydrochloric vs Sulfuric Acid for Pickling: Which Should Foundries Choose?
Walmir Rezende • 10/25/2025
Choosing the right pickling acid affects efficiency, costs and part quality in foundries. Compare hydrochloric and sulfuric acid and see which to choose.
Read MorepH Control in Pickling: 5 Key Factors for Stability in Foundries and Steel Mills
Walmir Rezende • 10/24/2025
Uncontrolled pH swings in pickling lead to rejected carbon steel parts. See the 5 key factors for keeping the process stable in foundries.
Read MoreChromium Recovery in Chrome Plating: The Circular Economy in Practice
Walmir Rezende • 10/23/2025
Recovering chromium from chrome plating effluents is an economic opportunity: it cuts treatment costs and turns hazardous waste into a resource.
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