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D1280-14 – Standard Test Method Technical Guide
This standard guide defines the procedure for evaluating the corrosive effects of soak tank metal cleaners on metals under total immersion, specifically excluding aluminum and its alloys. Corrosion is assessed via quantitative measurement of weight change or qualitative visual inspection. The primary goal is to distinguish cleaners that prove excessively corrosive for their intended application.
🧪 Apparatus and Environmental Specifications
The core apparatus required by the standard includes a borosilicate glass test tube measuring 38 mm in diameter by 300 mm in length (approx. 300 mL capacity), fitted with an Allihn-type condenser with a 200–250 mm jacket for boiling point tests. Temperature control is a critical parameter, requiring a tolerance of ±1°C (±2°F). For simulating ambient conditions, a temperature of 35 ± 1°C (95 ± 2°F) is specified. An environmental chamber capable of maintaining 90% relative humidity is required for residual cleaner corrosion testing.
| 🟦 Apparatus | 📏 Specification | 🎯 Tolerance / Detail |
|---|---|---|
| Test Tube | 38 mm × 300 mm | ~300 mL capacity |
| Condenser | Allihn-type, 200–250 mm jacket | Required for boiling point tests |
| Temperature Tolerance | ±1°C (±2°F) | Maintained by constant-temperature bath |
| Room Temp Standard | 35 ± 1°C (95 ± 2°F) | Slightly above ambient for stability |
| Humidity Chamber | 90% Relative Humidity | Residual cleaner film testing |
🔬 Test Procedure and Significance
This guide is used to determine if a cleaner is excessively corrosive to metals. It is critical that test conditions simulate the intended use application. Specimens must remain fully immersed, and the ratio of immersed metal surface area to volume of the cleaning solution must be carefully controlled. The user of the standard defines the acceptable level of corrosion, measured as weight loss per unit area or as a change in surface appearance.
💡 Technical Tip: To yield the most accurate and relevant data, always configure the test duration, temperature, and concentration of the cleaner to mirror the specific industrial cleaning process, as highlighted in Section 1.2 of the standard.
📊 Quantitative and Qualitative Analysis
The evaluation of the specimens is dual-faceted. The quantitative method relies on precise weighing of the specimen before and after the test to calculate the mass loss per unit of exposed surface area. The qualitative method involves a visual examination for defects such as etching, pitting, discoloration, or tarnishing. A specific procedure evaluates the effect of residual cleaner film on the metal’s corrosion behavior by exposing contaminated specimens to the 90% RH environment.
⚠️ Safety Precautions: Section 1.5 mandates that users review all relevant Material Safety Data Sheets (MSDS) for reagents and test solutions. It is the responsibility of the user to implement appropriate safety, health, and regulatory practices before conducting the test.
❓ Frequently Asked Questions
🔍 What metals are excluded from the scope of this standard?
Aluminum and its alloys are specifically excluded from this guide. Corrosion testing for aluminum was historically covered under ASTM D930 (now withdrawn). This guide covers all other common metals.
💡 How is corrosion evaluated under this test method?
Evaluation is performed either quantitatively by measuring weight loss per unit area of the specimen, or qualitatively by directly observing changes in the metal’s surface appearance for defects like pitting or tarnishing.
⚡ What temperature is considered “room temperature” for this test?
To ensure reproducibility, the standard specifies a temperature of 35 ± 1°C (95 ± 2°F) for simulating room