CAVITATION EROSION BEHAVIOR OF 20SiMnLOW ALLOY STEEL IN DISTILLED WATERAND 3% SODIUM CHLORIDE SOLUTION

J Chin Soc Corr Pro

2003, Vol. 23

Issue (4): 206-210 DOI:

Research Report

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CAVITATION EROSION BEHAVIOR OF 20SiMnLOW ALLOY STEEL IN DISTILLED WATERAND 3% SODIUM CHLORIDE SOLUTION

Suzhen Luo;Hemin Jing;Yugui Zheng

中科院金属所

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Abstract The cavitation erosion behavior of 20SiMn low alloy steel in both distilled water and 3%NaCl solution was investigated by using a m agnetostrictive-induced cavitation facility.The micrographs of damaged surfaces were observed by scanning electron microscope (SEM).The role of corrosion was an alyzed by the measurements of polarization curve and free-corrosion potential wi th or without cavitation.The results showed that the cavitation shifted free cor rosion potential to the positive direction by 200 mV.The electrochemical corrosi on rate in the presence of cavitation was 53 times higher than that in absence o f cavitation.The maximum cavitation erosion rate in 3%NaCl solution was almost t hree times as fast as that in distilled water,while the morphologies of damaged surfaces in 3%NaCl solution were similar to that in distilled water.The ferrite area,grain boundaries and ferrite-pearlite phase boundaries were preferential si tes for cavitation attack,which attributed to the low hardness of ferrite phase. The mass loss came from the detachment of small pieces in the ferrite area in th e early stage and from the removal of massive chunks by the propagation and conn ection of cracks in both ferrite and pearlite area in the following test period. 

Key words: cavitation erosion corrosion effect 20SiMn low alloy s teel 3%NaCl solution electrochemistry

Received: 28 February 2002

ZTFLH:

TG174.2

Corresponding Authors: Suzhen Luo E-mail: ygzheng@jcpm.syb.ac.cn

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Suzhen Luo; Hemin Jing; Yugui Zheng. CAVITATION EROSION BEHAVIOR OF 20SiMnLOW ALLOY STEEL IN DISTILLED WATERAND 3% SODIUM CHLORIDE SOLUTION. J Chin Soc Corr Pro, 2003, 23(4): 206-210 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I4/206

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