靜水壓力和預(yù)應(yīng)力對新型Ni-Cr-Mo-V高強鋼腐蝕行為的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-03-31
通過腐蝕速率的測量和腐蝕形貌的SEM觀察, 結(jié)合點蝕形態(tài)的統(tǒng)計分析和點蝕內(nèi)部及周圍應(yīng)力分布的有限元(FE)分析, 研究了靜水壓力和預(yù)加載拉伸應(yīng)力對新型 Ni-Cr-Mo-V 在模擬深海環(huán)境中的腐蝕行為的影響.
靜水壓力和預(yù)應(yīng)力對新型Ni-Cr-Mo-V高強鋼腐蝕行為的影響EFFECT OF HYDROSTATIC PRESSURE AND PRE-STRESS ON?CORROSION BEHAVIOR OF A NEW TYPE Ni-Cr-Mo-V HIGH STRENGTH?STEEL通過腐蝕速率的測量和腐蝕形貌的SEM觀察, 結(jié)合點蝕形態(tài)的統(tǒng)計分析和點蝕內(nèi)部及周圍應(yīng)力分布的有限元(FE)分析, 研究了靜水壓力和預(yù)加載拉伸應(yīng)力對新型 Ni-Cr-Mo-V 在模擬深海環(huán)境中的腐蝕行為的影響. 結(jié)果表明, 隨靜水壓力和預(yù)應(yīng)力的升高, Ni-Cr-Mo-V 高強鋼的腐蝕速率增大, 表現(xiàn)在點蝕的萌生、發(fā)展和合并過程. 靜水壓力促進了點蝕微孔的萌生和在高強鋼表面的隨機分布. 靜水壓力和預(yù)應(yīng)力在點蝕的生長過程中表現(xiàn)出了交互作用, 這在高預(yù)應(yīng)力水平下更加顯著. 靜水壓力以促進點蝕沿平行于表面的生長為主, 預(yù)應(yīng)力是使點蝕深度增大的要素. 點蝕易于沿垂直于預(yù)應(yīng)力方向合并. 隨著靜水壓力和預(yù)應(yīng)力的升高, 點蝕徑深比增大, Ni-Cr-Mo-V 高強鋼向均勻腐蝕轉(zhuǎn)變.
The efforts on deep sea exploration and development have posed many challenges on the corrosion?resistance and safety use of high strength steel in recent years. This has attracted a lot of attentions on the?corrosion behavior of high strength steel in deep sea environment. Hydrostatic pressure has been identified as one?of the most significant factors that affect pitting corrosion of materials or steel structures used in deep sea.?However, pre-stress introduced by the actual service conditions is probably another critical factor of deep sea?corrosion. The purpose of this work is to investigate the corrosion behavior of a new type Ni-Cr-Mo-V high?strength steel under the combined stresses of hydrostatic pressure and preloaded tensile stress in simulated?deep-sea environment. Corrosion rate measurement, SEM observation, statistical analysis of pitting geometry and?finite element (FE) analysis were used in this work. The results indicated that corrosion rate of Ni-Cr-Mo-V high?strength steel increased with the increase of hydrostatic pressure and pre-stress. The deterioration of corrosion?resistance of the steel mainly reflected in pit initiation, pit growth and pit coalescence. Rather than pre-stress,?hydrostatic pressure exhibited obvious effect on promoting pit initiation. Pits initiated in the form of corrosion?pin-holes, which randomly distributed at the corroded surface. Both hydrostatic pressure and pre-stress facilitated?pit growth, and there was an interaction between them, which was more remarkable at higher pre-stress.?Hydrostatic pressure was mainly responsible for pit growth parallel to the steel surface, while pre-stress was?essential to pit depth increase. Adjacent pits were inclined to coalesce in the direction perpendicular to pre-stress. ?With the increase of hydrostatic pressure and pre-stress, the aspect ratio of pits increased, which can lead to the?formation of uniform corrosion.?
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