pH Neutral Cleaning Agents: Technology and PerformanceAuthors: Terry Price, Ph.D. and Axel Vargas
Company: ZESTRON Americas and Lockheed Martin
Date Published: 9/22/2019 Conference: SMTA International
Modern cleaning agents can be alkaline or pH neutral depending on the degree of solvency required. Each are environmentally friendly as they are biodegradable and HAP free. However, in addition to excellent material compatibility and ease of handling, pH neutral formulations have the added advantage of potentially eliminating the need for waste water neutralization.
Effective cleaning processes require an optimized balance of mechanical, thermal and chemical energy. Cleaning agents provide the chemical energy. As electronic assemblies are completely washed with the cleaning agent, these are formulated with inhibition packages as this is required in order to ensure effective material compatibility with the substrate and component materials. To maintain and ensure a stable pH throughout the life of a wash, pH neutral formulations contain an adequate buffering package in order to maintain a stable pH level as flux residues accumulate with the wash solution.
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