Walmir Rezende

Responsible Chemist

Page 3 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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Pickling Bath Saturation: How to Identify and Correct It

Author: 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.

Pickling 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.

Hydrochloric 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.

pH 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.

Chromium 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.

Environmental Licensing for Anodizing Operations: Complete 2025 Checklist

Walmir Rezende • 10/22/2025

Environmental licensing for anodizing and chrome plating has become stricter: see a complete checklist of compliance requirements and technical documentation for 2025.

Sustainable Anodizing: Optimizing Processes and Reducing the Environmental Impact of Chrome Plating

Walmir Rezende • 10/21/2025

Learn how to optimize anodizing and chrome plating processes, reduce environmental impact and apply circular economy principles without losing technical quality in surface treatment.

Type II vs Type III Anodizing: Differences and Industrial Applications

Walmir Rezende • 10/21/2025

Choosing between Type II and Type III anodizing is a decisive step in surface treatment: each process forms aluminum oxide layers with distinct characteristics.

Electroplating Wastewater Treatment Systems: A Complete Compliance Guide

Walmir Rezende • 10/20/2025

Technical compliance guide for electroplating wastewater: CONAMA 430/2011 parameters, treatment stages and an implementation checklist.

Chemical Inputs for Neutralization in Electroplating Wastewater Treatment

Walmir Rezende • 10/19/2025

Neutralization is a key step in electroplating wastewater treatment, with pH control between 5.0 and 9.0 required by CONAMA Resolution 430/2011.

COD in Electroplating Wastewater: Tertiary Treatment and CONAMA 430 Compliance

Walmir Rezende • 10/18/2025

COD (Chemical Oxygen Demand) is often the hardest CONAMA 430/2011 parameter for electroplating shops to meet. Tertiary treatment is required for compliance.

Coagulants and Flocculants for Metal Precipitation in Electroplating Shops

Walmir Rezende • 10/17/2025

Coagulation and flocculation are essential steps in treating electroplating wastewater to remove heavy metals and comply with CONAMA Resolution 430/2011.