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| <!DOCTYPE html> | ||
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| <title>Corr - Joey Blog</title> | ||
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| <meta name="description" content="Stern-Geary测量腐蚀速率的原理主要基于电化学理论，尤其是它通过测量极化电阻（(R_p)）来推导出腐蚀速率。该方法依赖于Stern-Geary方程，该方程将腐蚀电流密度（(i_{\text{corr}})）与极化电阻联系起来。核心原理可以分为几个关键步骤来解释： | ||
| 1. 极化电阻的测量： 在电化学腐蚀过程中，当施加一个非常小的电势扰动（正负数十毫伏）到腐蚀电池中时，系统会发生电流响应。这个电流响应的斜率，即电位和电流的比值，就称为极化电阻（(R_p)）。极化电阻可以通过以下公式定义： | ||
| $$ R_p = \left( \frac{dE}{dI} \right){\text{at } E{\text{corr}}} $$ | ||
| 其中： | ||
| (E) 是电极电位， (I) 是电流， (E_{\text{corr}}) 是腐蚀电位。 这种电位-电流斜率反映了系统对极化扰动的抵抗性，它与腐蚀速率密切相关。 | ||
| 2. Stern-Geary方程： 通过Stern-Geary方程，极化电阻可以与腐蚀电流密度（(i_{\text{corr}})）直接联系起来，公式如下： | ||
| $$ i_{\text{corr}} = \frac{B}{R_p} $$ | ||
| 其中： | ||
| (i_{\text{corr}}) 是腐蚀电流密度（单位：A/cm²）， (B) 是一个常数，称为Stern-Geary常数，通常根据Tafel斜率计算得出， (R_p) 是极化电阻。 3. Stern-Geary常数 (B)： (B) 常数的值取决于阳极和阴极的Tafel斜率（(b_a) 和 (b_c)），通过以下公式计算： | ||
| $$ B = \frac{b_a \cdot b_c}{2.303(b_a + b_c)} $$ | ||
| 其中： | ||
| (b_a) 和 (b_c) 分别是阳极和阴极反应的Tafel斜率，反映了电极反应速度随电位变化的敏感性。 4. 计算腐蚀速率： 一旦得到了腐蚀电流密度 (i_{\text{corr}})，就可以进一步计算腐蚀速率。腐蚀速率通常用金属的失重或厚度减少来表示，公式如下： | ||
| $$ v_{\text{corrosion}} = \frac{K \cdot i_{\text{corr}} \cdot \text{Eq.Wt.}}{\rho \cdot A} $$" /> | ||
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| Joey Blog | ||
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| <div class="font:40 font:extrabold">Corr</div> | ||
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| <time>Oct 9, 2024</time> | ||
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| "><p><strong>Stern-Geary测量腐蚀速率的原理</strong>主要基于电化学理论，尤其是它通过测量极化电阻（(R_p)）来推导出腐蚀速率。该方法依赖于Stern-Geary方程，该方程将腐蚀电流密度（(i_{\text{corr}})）与极化电阻联系起来。核心原理可以分为几个关键步骤来解释：</p> | ||
| <h3 id="1-极化电阻的测量">1. 极化电阻的测量：</h3> | ||
| <p>在电化学腐蚀过程中，当施加一个非常小的电势扰动（正负数十毫伏）到腐蚀电池中时，系统会发生电流响应。这个电流响应的斜率，即电位和电流的比值，就称为极化电阻（(R_p)）。极化电阻可以通过以下公式定义：</p> | ||
| <p>$$ | ||
| R_p = \left( \frac{dE}{dI} \right)<em>{\text{at } E</em>{\text{corr}}} | ||
| $$</p> | ||
| <p>其中：</p> | ||
| <ul> | ||
| <li>(E) 是电极电位，</li> | ||
| <li>(I) 是电流，</li> | ||
| <li>(E_{\text{corr}}) 是腐蚀电位。</li> | ||
| </ul> | ||
| <p>这种电位-电流斜率反映了系统对极化扰动的抵抗性，它与腐蚀速率密切相关。</p> | ||
| <h3 id="2-stern-geary方程">2. Stern-Geary方程：</h3> | ||
| <p>通过Stern-Geary方程，极化电阻可以与腐蚀电流密度（(i_{\text{corr}})）直接联系起来，公式如下：</p> | ||
| <p>$$ | ||
| i_{\text{corr}} = \frac{B}{R_p} | ||
| $$</p> | ||
| <p>其中：</p> | ||
| <ul> | ||
| <li>(i_{\text{corr}}) 是腐蚀电流密度（单位：A/cm²），</li> | ||
| <li>(B) 是一个常数，称为Stern-Geary常数，通常根据Tafel斜率计算得出，</li> | ||
| <li>(R_p) 是极化电阻。</li> | ||
| </ul> | ||
| <h3 id="3-stern-geary常数-b">3. Stern-Geary常数 (B)：</h3> | ||
| <p>(B) 常数的值取决于阳极和阴极的Tafel斜率（(b_a) 和 (b_c)），通过以下公式计算：</p> | ||
| <p>$$ | ||
| B = \frac{b_a \cdot b_c}{2.303(b_a + b_c)} | ||
| $$</p> | ||
| <p>其中：</p> | ||
| <ul> | ||
| <li>(b_a) 和 (b_c) 分别是阳极和阴极反应的Tafel斜率，反映了电极反应速度随电位变化的敏感性。</li> | ||
| </ul> | ||
| <h3 id="4-计算腐蚀速率">4. 计算腐蚀速率：</h3> | ||
| <p>一旦得到了腐蚀电流密度 (i_{\text{corr}})，就可以进一步计算腐蚀速率。腐蚀速率通常用金属的失重或厚度减少来表示，公式如下：</p> | ||
| <p>$$ | ||
| v_{\text{corrosion}} = \frac{K \cdot i_{\text{corr}} \cdot \text{Eq.Wt.}}{\rho \cdot A} | ||
| $$</p> | ||
| <p>其中：</p> | ||
| <ul> | ||
| <li>(K) 是单位换算常数（通常为3.27 × 10(^3)），</li> | ||
| <li>(i_{\text{corr}}) 是腐蚀电流密度，</li> | ||
| <li>(\text{Eq.Wt.}) 是金属的当量重量，</li> | ||
| <li>(\rho) 是金属密度，</li> | ||
| <li>(A) 是暴露表面积。</li> | ||
| </ul> | ||
| <h3 id="总结">总结：</h3> | ||
| <p>Stern-Geary法通过测量极化电阻 (R_p)，结合Stern-Geary方程和Tafel斜率，得出腐蚀电流密度 (i_{\text{corr}})，进而可以计算出腐蚀速率。这种方法尤其适用于均匀腐蚀过程的电化学测量，提供了一种快速、非破坏性的方法来评估材料的腐蚀行为。</p> | ||
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