Exploration of tribocorrosion behavior of Fe-based amorphous coating in simulated seawater
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FeCrNiMoCBSi amorphous coating was prepared on marine steel F22 using plasma spraying technique for marine protection. The tribocorrosion behavior of Fe-based amorphous coating was explored in simulated seawater. The material loss of the coating in tribocorrosion behavior was attributed to the combination of wear and corrosion. To identify the interaction between wear and corrosion, the friction behavior of the coating was studied at different applied potentials using an electrochemical workstation. These results revealed that wear was a major factor in the material loss of the coating under the present tribology condition, whereas corrosion was retarded due to the good anti-corrosion properties of the Fe-based amorphous coating. The interaction between corrosion and wear in seawater was positive, indicating that corrosion promoted wear and corrosion promoted wear. The findings provide new insights into the wear-corrosion synergy effect on Fe-based amorphous coating under load-chemistry coupled conditions, and offer available supports for the design of marine protective coatings.Keywords:
Tribocorrosion
Artificial seawater
A simulated flowing seawater corrosion test system was set up,the corrosion behaviors of carbon steels in simulated seawater were studied using the system.The weight loss tests of A3,20# and X70 steels were conducted to show the corrosion rate data in static and flowing seawater for comparison.Results showed that the corrosion of A3,20# and X70 steels was accelerated in the flowing seawater due to the erosion-corrosion effect on the surfaces of metal materials.The corrosion rate showed a decrease first and then an increase,and gradually became stable later.The rust layers were divided significantly into two layers in the flowing water experiment.
Carbon steel
Rust (programming language)
Artificial seawater
Erosion corrosion
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Carbon fibers
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Corrosion data of five chromium steels immersed in seawater for 1,2,4,8 years were obtained. Effect of chromium on corrosion resistance of the steels in seawater were evaluated. Corrosion resistance of chromium steels in seawater changes not only with chromium content, but also with other alloying elements combined with Cr. Corrosion resistance of steels in seawater increases with chromium content for a short term immersion. For a long term immersion, chromium decreases corrosion resistance of steels in seawater. The difference between the effect of combined about 1%Cr and Mo(\|Al) on corrosion resistance of steel and the effect of chromium itself is not obvious. Over 2%Cr combined with Mo(\|Al) increases corrosion resistance of steels for a short term immersion by a big margin, and the time that corrosion resistance of chromium steels becomes worse than carbon steel is obviously postponed. While, Cr content less than 1% combined with Mn\|Cu, Cu\|Si\|V, Ni\|Cu\|Si or Ni\|Mn is harmful to corrosion resistance of steel in seawater.
Immersion
Artificial seawater
Carbon steel
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Tribocorrosion
Bronze
Artificial seawater
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Corrosion results of 7 types of cast stainless steels exposed to natural seawater at Qingdao sea area of China for 3 years and flowing seawater containing sand for 20 days were obtained using exposure and erosion-corrosion test. Their corrosion behavior was discussed. Corrosion resistance of ZG0Cr13Ni4Mo, ZG1Cr18Ni9Ti and ZG0Cr17Ni12Mo2 in seawater were very poor. High Cr, high Mo(-N) cast stainless steels ZG0Cr20Ni25Mo5, ZG0Cr25Ni6Mo3CuN, ZG0Cr25Ni9Mo4CuRe and ZG0Cr20Ni18Mo6N in seawater had good corrosion resistance. Corrosion of cast stainless steels in full immerse zone was serious than their corrosion in tidal zone. In flowing seawater containing sand, corrosion resistance of ZG0Cr13Ni4Mo was relatively poor, and corrosion resistance of ZG0Cr17Ni12Mo2, ZG0Cr25Ni9Mo4CuRe and ZG0Cr20Ni18Mo6N was relatively good.
Artificial seawater
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Tribocorrosion
Carbon steel
Carbon fibers
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Delamination
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The experiment uses a thick CrN coating to carry out the surface protection over the key frictional parts of marine equipments. The coating has been systematically characterized and UMT-3 reciprocating friction and wear testing machine has been used to test the tribological properties in seawater environment. The results show that the coating is as thick as 7 m and the friction coefficient in atmospheric environment is larger than that in seawater and pure water. This is because the water molecules in the solution have played the role of boundary lubrication to a certain extent. The wear rate of CrN coating in seawater is lower than that in atmosphere and pure water, which is attributed to the low friction coefficient in seawater and the excellent corrosion resistance of CrN coating. The wear rate of the coating in seawater is 20% of that of 316 L stainless steel under the same condition, which has obvious effect of antifriction and wear resistance.
Reciprocating motion
Artificial seawater
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Corrosion behavior of chromium containing low alloyed steels immersed in seawater were studied; The variation of their corrosion rate with time as well as effect of chromium on seawater corrosion of the steels were analyzed. New views on “corrosion resistance reverse” of chromium steels and the effect of chromium on seawater corrosion resistance were postulated.After immesion in seawater for long time a reverse of the corrosion resistance of chromium steels do occur.Corrosion rate of carbon steels descend with immersion time.For chromium steels, the situation is opposite. Chromium debases the corrosion rate of steel in seawater at initial stage.In the meantime,it altered the corrosion character of the steel that corrosion rate of steel gradually ascend with immersion time.Accordingly, “corrosion resistance reverse” of chromium steels that immerse in seawater for long time was caused.
Immersion
Carbon steel
Artificial seawater
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