【摘要】：目的通過(guò)研究42CrMo鉆具用鋼在常溫下不同Cl~-濃度溶液中的腐蝕行為,為其腐蝕速率的預(yù)測(cè)奠定一定基礎(chǔ)。方法采用浸泡實(shí)驗(yàn)、電化學(xué)測(cè)試技術(shù)研究42CrMo在不同濃度NaCl溶液中的平均腐蝕速率和電化學(xué)特性,并結(jié)合SEM掃描電鏡對(duì)浸泡58 h后的掛片試樣進(jìn)行分析。結(jié)果浸泡實(shí)驗(yàn)分析表明,當(dāng)Cl~-達(dá)到60 g/L時(shí),42CrMo鋼的腐蝕速率達(dá)到最大值,為0.124 g/(m~2·h);當(dāng)Cl~-濃度繼續(xù)增大時(shí),腐蝕速率隨Cl~-濃度的增加而逐漸減小。開(kāi)路電位Eocp分析表明,隨著Cl~-濃度的增加,Eocp總體呈現(xiàn)下降趨勢(shì),顯示出較大的腐蝕傾向性。極化曲線分析表明,陰極極化曲線的斜率明顯比陽(yáng)極大,并且自腐蝕電流密度在60 g/L Cl~-溶液中達(dá)到最大值,為5.952 35μA/cm~2。腐蝕形貌研究表明,42CrMo浸泡58 h后,表面的腐蝕產(chǎn)物分布并不均勻,均發(fā)生了局部點(diǎn)蝕現(xiàn)象。結(jié)論隨著Cl~-濃度的不斷增大,42CrMo鋼的平均腐蝕速率呈現(xiàn)先增大后減小的趨勢(shì),且在Cl~-為60 g/L時(shí),平均腐蝕速率最大。42CrMo鋼在靜態(tài)常溫下高Cl~-濃度溶液中以局部點(diǎn)蝕為主,其電化學(xué)腐蝕過(guò)程主要受陰極去氧極化的控制。
[Abstract]:Objective to study the corrosion behavior of 42CrMo drilling tool steel in solution of different Cl~- concentration at room temperature, and to lay a foundation for predicting its corrosion rate. Methods the average corrosion rate and electrochemical characteristics of 42CrMo in different concentrations of NaCl solution were studied by immersion test and electrochemical test. The specimens after 58 h immersion were analyzed by SEM scanning electron microscope (SEM). Results the immersion test showed that the corrosion rate of 42CrMo steel reached the maximum when Cl~- reached 60 g / L, which was 0.124 g / (m ~ (-2) h);). When the concentration of Cl~- continued to increase, the corrosion rate gradually decreased with the increase of Cl~- concentration. The open-circuit potential (Eocp) analysis showed that with the increase of Cl~- concentration, Eocp showed a downward trend and showed a large corrosion tendency. Polarization curve analysis shows that the slope of the cathodic polarization curve is obviously larger than that of the anode, and the self-etching current density reaches the maximum value in 60 g / L Cl~- solution, which is 5.952 渭 A / cm ~ (2). The corrosion morphology study showed that the corrosion products were distributed inhomogeneously after immersion for 58 h, and the local pitting corrosion occurred on the surface of C42CrMo. Conclusion with the increasing of Cl~- concentration, the average corrosion rate of 42CrMo steel increases first and then decreases. When Cl~- is 60 g / L, the maximum corrosion rate of steel is local pitting corrosion in the solution with high Cl~- concentration at static room temperature. The electrochemical corrosion process is mainly controlled by cathodic deoxidation polarization.
【作者單位】： 重慶科技學(xué)院冶金與材料工程學(xué)院;
【基金】：重慶科技學(xué)院校內(nèi)科研基金資助項(xiàng)目(CK2015Z18);重慶科技學(xué)院研究生科技創(chuàng)新項(xiàng)目(YKJCX1620202) 重慶高校優(yōu)秀成果轉(zhuǎn)化項(xiàng)目(KJZH17136)~~
【分類號(hào)】：TG178

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