Walmir Rezende

Responsible Chemist

Page 2 of 6

Technical articles

Specialized content

Since 1972

Over 50 years of experience

Responsible Chemist at Boreto & Cardoso, an industrial chemicals distributor founded in 1972. He is in charge of the technical documentation of the products, such as Certificates of Analysis and Safety Data Sheets, and of the technical review of the blog articles.

68 articles

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Articles by Walmir Rezende

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Sulfuric Acid vs Hydrochloric Acid in Water Treatment: Which to Choose and Why

Author: Walmir Rezende • 07/31/2026

A technical comparison of sulfuric acid and hydrochloric acid for pH adjustment in water treatment, with objective selection criteria.

Sulfuric Acid for pH Adjustment in Water and Wastewater Treatment Plants: Dosing and Best Practices

Walmir Rezende • 07/31/2026

How and when to use sulfuric acid for pH adjustment in water and wastewater treatment plants, with best practices for dilution, dosing point and operational safety.

Sulfuric Acid in Electropolishing (Bright Dipping) of Brass and Copper Jewelry

Walmir Rezende • 07/30/2026

The role of sulfuric acid in electropolishing brass and copper jewelry: its function in the bath, handling precautions and how purity affects the finish.

Sulfuric Acid Concentration in Type II Anodizing Baths: Process Parameters

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.

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.

Sulfuric 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.

Industrial Sulfuric Acid: Complete Guide to Applications, Concentrations and Choosing the Right Grade

Walmir Rezende • 07/28/2026

A complete overview of industrial sulfuric acid: properties, main applications, the difference between 98% and analytical grade, and how to choose the right grade.

How to Dilute Sulfuric Acid Safely: Why You Always Add Acid to Water

Walmir Rezende • 07/28/2026

Understand why the order of addition matters when diluting sulfuric acid and what the correct procedure is for diluting the product safely.

Lot 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.

Transcribed 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.

Acid 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.

Certificate 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.