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What is the difference between ASTM G85 and ASTM B117?
2023/11/20
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<p>ASTM G85 and ASTM B117 are both standards developed by ASTM International (formerly known as the American Society for Testing and Materials) for testing the corrosion resistance of materials. However, they are designed for different purposes and involve different testing conditions. Here are the key differences between ASTM G85 and ASTM B117:</p>
<h3>ASTM G85:</h3>
<ol>
<li>
<p><strong>Title:</strong></p>
<ul>
<li>ASTM G85 is titled "Standard Practice for Modified Salt Spray (Fog) Testing."</li>
</ul>
</li>
<li>
<p><strong>Purpose:</strong></p>
<ul>
<li>ASTM G85 is primarily used to evaluate the corrosion resistance of materials when exposed to a salt spray or fog environment with modifications. This test is often employed to simulate the effects of corrosive atmospheres on materials in service.</li>
</ul>
</li>
<li>
<p><strong>Testing Conditions:</strong></p>
<ul>
<li>ASTM G85 provides several different test cycles, including the Acetic Acid Salt Spray (AASS) test, the Copper-Accelerated Acetic Acid Salt Spray (CASS) test, and the Prohesion test. These tests involve exposure to salt spray combined with acidified environments to accelerate the corrosion process.</li>
</ul>
</li>
<li>
<p><strong>Materials Tested:</strong></p>
<ul>
<li>ASTM G85 is applicable to a wide range of metallic materials, including coatings, and is commonly used in the automotive and aerospace industries.</li>
</ul>
</li>
</ol>
<h3>ASTM B117:</h3>
<ol>
<li>
<p><strong>Title:</strong></p>
<ul>
<li>ASTM B117 is titled "Standard Practice for Operating Salt Spray (Fog) Apparatus."</li>
</ul>
</li>
<li>
<p><strong>Purpose:</strong></p>
<ul>
<li>ASTM B117 is a more general standard that outlines the procedures for operating a salt spray (fog) apparatus. It is not specifically focused on modified conditions like ASTM G85.</li>
</ul>
</li>
<li>
<p><strong>Testing Conditions:</strong></p>
<ul>
<li>ASTM B117 provides guidelines for conducting salt spray tests in a controlled chamber, creating a corrosive environment with a salt spray mist. The test duration and conditions are specified, but there are no modifications such as those found in ASTM G85.</li>
</ul>
</li>
<li>
<p><strong>Materials Tested:</strong></p>
<ul>
<li>ASTM B117 is applicable to a wide range of metallic and non-metallic materials. It is commonly used to evaluate the corrosion resistance of coatings, paints, and various surface treatments.</li>
</ul>
</li>
</ol>
<h3>Key Differences:</h3>
<ol>
<li>
<p><strong>Focus and Application:</strong></p>
<ul>
<li>ASTM G85 is more specific in its focus, providing practices for modified salt spray tests to simulate specific corrosive environments. ASTM B117, on the other hand, is a general practice for operating a salt spray apparatus, suitable for a broader range of materials and applications.</li>
</ul>
</li>
<li>
<p><strong>Test Cycles:</strong></p>
<ul>
<li>ASTM G85 includes different test cycles with modifications, such as the addition of acetic acid or copper, to accelerate the corrosion process. ASTM B117, in contrast, is a standard salt spray test without such modifications.</li>
</ul>
</li>
<li>
<p><strong>Industries and Applications:</strong></p>
<ul>
<li>ASTM G85 is often used in industries where materials are exposed to aggressive environments, such as the automotive and aerospace industries. ASTM B117 is widely used for general corrosion testing in various industries, including coatings, paints, and surface treatments.</li>
</ul>
</li>
</ol>
<p>In summary, while both standards involve salt spray testing for corrosion resistance, ASTM G85 is more specific and includes modified conditions to simulate certain corrosive atmospheres, while ASTM B117 is a general standard for salt spray testing. The choice between them depends on the specific requirements of the material being tested and the desired simulation of environmental conditions.</p>
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