Investigation on Electrochemical Cathodic Protection for Cavitation-Erosion Reduction of Anodized Al Alloy

This study investigated the damage prevention potential range of anodized 5083-H321 aluminum alloy under a cavitation-erosion environment in seawater. Various applied potential conditions were determined through the cathodic polarization experiment. Then cavitation-erosion experiments were conducted with the applied potentials and the current density, weight loss, and surface damage depth were analyzed. The results presented excellent cavitation-erosion resistance in the concentration polarization section (−1.0~−0.8 V).

Download Full-text

Investigation on Ultrasonic Cavitation Erosion Behaviors of Al and Al-5Ti Alloys in the Distilled Water

Metals ◽

10.3390/met10121631 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1631

Author(s):

Jingtao Zhao ◽

Zongming Jiang ◽

Jingwen Zhu ◽

Junjia Zhang ◽

Yinglong Li

Keyword(s):

Cavitation Erosion ◽

Erosion Resistance ◽

Surface Damage ◽

Damage Mechanism ◽

Ultrasonic Cavitation ◽

Dislocation Slip ◽

Distilled Water ◽

New Device ◽

Cavitation Erosion Resistance ◽

Ultrasonic Cavitation Erosion

Al and Al-5Ti alloys were manufactured by an ultrasonic casting method with a new device, and their ultrasonic cavitation erosion behaviors of Al and Al-5Ti alloys in the distilled water were clarified. The damage mechanism was analyzed by macro photograph, scanning electronic micrograph and three-dimensional morphology, and the results demonstrate that Al-5Ti alloys have better cavitation erosion resistance than Al in terms of the mass loss and the surface damage. The deformation mechanism of Al and Al-5Ti alloys under cavitation erosion is mainly dislocation slip, and the Al3Ti phase enhances the cavitation erosion resistance of Al-5Ti alloys. In addition, the maximum depth of cavitation pits in the Al-5Ti sample is less than that in the Al sample for 31.3%.

Download Full-text

Cavitation Erosion Resistance of Sputter-Deposited Cr3Si Film on Stainless Steel

Journal of Tribology ◽

10.1115/1.4033049 ◽

2016 ◽

Vol 139 (1) ◽

Cited By ~ 13

Author(s):

Shuyun Jiang ◽

Hongqin Ding ◽

Jiang Xu

Keyword(s):

Electron Microscopy ◽

Stainless Steel ◽

Cavitation Erosion ◽

Erosion Resistance ◽

Surface Damage ◽

304 Stainless Steel ◽

Glow Discharge Plasma ◽

Damage Degree ◽

Average Grain Size ◽

Cavitation Erosion Resistance

In this technical brief, a Cr3Si nanocrystalline film was deposited on 304 stainless steel (SS) substrate using a double glow discharge plasma technique. The film was characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, nanohardness tester, and scratch tester. The as-deposited film with a thickness of 5 μm consisted of A15 structured Cr3Si phase with an average grain size of 8 nm. The hardness values of the film were determined to be 26 GPa, which was ten times greater than 304 SS. A self-designed ultrasonic vibration cavitation erosion apparatus was employed to evaluate the cavitation erosion resistance of the Cr3Si film. The results showed that after cavitation tests of 30 hrs, the erosion mass loss of the film was only 60% of that for 304 SS substrate. SEM observation of the erosion surfaces indicated that the surface damage degree of the Cr3Si film is significantly less than that of 304 SS.

Download Full-text

Comparison of Surface Damage Caused by Sliding Wear and Cavitation Erosion on Mechanical Face Seals

Journal of Tribology ◽

10.1115/1.3261020 ◽

1985 ◽

Vol 107 (2) ◽

pp. 200-205 ◽

Cited By ~ 4

Author(s):

Tsunenori Okada ◽

Yoshiro Iwai ◽

Yukio Hosokawa

Keyword(s):

Sliding Wear ◽

Cavitation Erosion ◽

Carbon Materials ◽

Surface Damage ◽

Mechanical Seals ◽

Worst Case ◽

Cavitation Intensity ◽

Erosion Test ◽

Cavitation Erosion Resistance ◽

Worn Surface

To clarify the dangerous surface damage in mechanical seals, both sliding wear and vibratory cavitation erosion tests were performed on sintered carbon materials. The differences in damage between cavitation erosion and sliding wear were investigated through observation of surface topographies and volume losses. Roughness, Ra, of worn surface is rather small, about 1 μm in the worst case, and is independent of the worn depth. In cavitation erosion, however, Ra of eroded surface increases rapidly and thereafter attains a large steady value (3.6 μm- 11 μm for various carbon materials) with increasing eroded depth regardless of the cavitation intensity. The sliding surfaces of actual operating mechanical seals were compared with our test results and thus it was concluded that the severe damage in the mechanical seals is caused by the concentrated repetition of cavitation erosion. Furthermore, the wear and cavitation erosion resistance were compared among the various carbon seal materials. From these results, it has become clear that the cavitation erosion test is important to find out the quality of mechanical seal materials.

Download Full-text