本文選題：AH鋼　切入點(diǎn)：潮差區(qū)　出處：《金屬學(xué)報(bào)》2017年11期

【摘要】：利用自制的模擬實(shí)驗(yàn)裝置模擬實(shí)海潮差,監(jiān)測(cè)了在模擬潮差區(qū)內(nèi)AH32長(zhǎng)尺試樣的電偶電流和電極電位變化情況。結(jié)果表明,由于供氧差異形成的宏電池作用,AH32長(zhǎng)尺試樣在潮差區(qū)和全浸區(qū)內(nèi)的電極電位分布不均衡,引發(fā)了內(nèi)部的電偶電流,其實(shí)質(zhì)為陰、陽(yáng)極反應(yīng)產(chǎn)生的凈電流。在潮差區(qū)內(nèi),AH32長(zhǎng)尺試樣不同部位的電偶電流隨潮位運(yùn)動(dòng)發(fā)生周期性變化;當(dāng)潮位最高時(shí),所有部位的電偶電流均處于極大值狀態(tài),且中間潮位部位的電偶電流最大,由此所引起的陽(yáng)極電流也最大。根據(jù)電偶電流的變化計(jì)算出的干燥、潤(rùn)濕和浸沒(méi)狀態(tài)的時(shí)間分布表明,AH32長(zhǎng)尺試樣在潮位區(qū)不同部位的腐蝕量取決于潤(rùn)濕和浸沒(méi)時(shí)間在該部位的分配。各部位在浸沒(méi)態(tài)時(shí)存在宏電池作用,產(chǎn)生電偶電流。而在潤(rùn)濕態(tài)下,由于薄液膜的溶液電阻很大,導(dǎo)致宏電池驅(qū)動(dòng)電位幾乎等于在薄液膜上的電壓降,因此宏電池作用極弱,且不產(chǎn)生電偶電流。潤(rùn)濕時(shí)間和潤(rùn)濕電量的關(guān)系顯示,潮位運(yùn)動(dòng)中AH32長(zhǎng)尺試樣的最大潤(rùn)濕時(shí)間出現(xiàn)在平均中潮位以上的部位,表明因潤(rùn)濕引起的該部位的腐蝕失重最大。結(jié)合由浸沒(méi)態(tài)引起的平均中潮位腐蝕失重最大的結(jié)果可以確定,在潮水漲落過(guò)程中AH32長(zhǎng)尺試樣的最大腐蝕失重量應(yīng)出現(xiàn)在平均中潮位偏上的部位,這與腐蝕速率的測(cè)量結(jié)果一致。
[Abstract]:The electric coupling current and electrode potential of AH32 long scale sample in the simulated tidal range were monitored by using a self-made simulation experiment device. The results show that the electric current and electrode potential of the AH32 long scale sample in the simulated tidal range are measured. Due to oxygen supply difference, the electrode potential distribution of AH32 long ruler sample is unbalanced in the tidal range and the whole immersion zone, which leads to the internal galvanic current, which is essentially negative. The net current produced by anodic reaction. The coupling current of AH32 long ruler specimen changes periodically with the tide level movement in the range of tidal difference. When the tide level is highest, the coupling current of all parts is in the state of maximum value. The coupling current at the middle tide level is the largest, and the anode current caused by it is also the largest. The time distribution of wetting and immersion states indicates that the corrosion amount of AH32 specimen in different parts of tidal zone depends on the distribution of wetting and immersion time in this part. In the wet state, however, because the solution resistance of the thin liquid film is very large, the driving potential of the macro cell is almost equal to the voltage drop on the thin liquid film, so the action of the macro cell is extremely weak. The relation between wetting time and wetting quantity shows that the maximum wetting time of AH32 long scale specimen appears in the position above the average middle tide level in tidal level movement. The results show that the corrosion weight loss of this part is the largest due to wetting. Combined with the results of the maximum corrosion loss at the average mid-tidal level caused by immersion, it can be determined that, In the process of tidal fluctuation, the maximum corrosion weight loss of AH32 long scale specimen should appear in the position above the average middle tide level, which is consistent with the result of corrosion rate measurement.
【作者單位】： 中國(guó)科學(xué)院金屬研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目No.51671200 國(guó)家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目No.2015AA034301 國(guó)家腐蝕平臺(tái)基金 中國(guó)科學(xué)院海洋研究所海洋環(huán)境腐蝕與生物污損重點(diǎn)實(shí)驗(yàn)室資助項(xiàng)目No.MCKF201611~~
【分類(lèi)號(hào)】：TG172.5

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