Prevention Of Erosive Wear Research Articles

Study of Erosion on Metal Meterals for High Pressure Pipe Manifolds

The fracturing fluid with solid particles in the process of high-speed injects to high pressure pipe manifolds will cause serious erosion damage, lead to serious material loss and equipment failure. Thus the prevention of erosive wear on high pressure pipe manifolds is regarded as one of the most important problems in practical engineering. In this paper, a new type of test machine was developed to simulate the erosive wear behavior of metal materials caused by the multiphase fluid such as fracturing fluid, and study the erosion failure mechanism by various metal erosion influencing factors including the velocity of multiphase flow, solid particles of fracturing proppant and impact angles, etc. The erosion-wear experiments on 30CrMo steels used in high-pressure pipe manifolds is described in detail. Finally, the microcosmic surface testing was also used to analyze the erosion failure mechanism of metal materials for high pressure pipe manifolds.

Inhibition of Erosive Wear by Fluoride Varnish

It has been suggested that fluoride products with a protective mechanical component are advantageous in the prevention of erosive wear. The aim of this study was to evaluate in situ the effect of fluoride varnish (FV) in the prevention of wear due to erosion and combined erosion and toothbrush abrasion. Eleven volunteers wore for 3 weeks, during working hours, appliances containing 2 control and 2 FV-treated human enamel samples. Erosion took place extraorally 3 times a day (5 min) in the soft drink Sprite. At the end of each experimental day one control and one FV sample (C-er+abr and FV-er+abr) were brushed (5 s) with fluoridated dentrifice. The remaining control and FV sample (C-er and FV-er) were left unbrushed. Enamel volume loss was quantified by optical profilometry at day 5, 10 and 15. A statistically significant progression in enamel loss was found for the C-er, C-er+abr and FV-er+abr groups (p < 0.001, p < 0.001 and p = 0.001, respectively) but not for the FV-er group (p = 0.053). The values of cumulative normalized volume loss (×10⁸ µm) at day 15 were: C-er 5.53 ± 2.14, C-er+abr 5.70 ± 2.07, FV-er 0.79 ± 0.67 and FV-er+abr 2.76 ± 1.35. The FV-er and FV-er+abr groups showed significant lower volume loss than the C-er group (p < 0.001 and p = 0.005, respectively) and the C-er+abr group (p < 0.001 and p = 0.002, respectively). The results indicate that fluoride varnish is effective in the reduction of erosive wear.

Erosion visualisation and characteristics of a two dimensional diffusion treated martensitic stainless steel hydrofoil

Erosive wear of complicated water pump and hydro turbine blades is a complex problem. This is due mainly to the many variables involved in the erosive wear. These depend upon type of erodant, base material and flow conditions. In this paper, visualisation and prevention of erosive wear on two dimensional forged 12Cr and 13Cr4Ni cast steel hydrofoils under flow conditions similar to that of hydroturbines and water pumps is described. An experimental study was taken using a rotating disc apparatus. From the study, it was observed that the erosion of complicated hydrofoils depends on the flow conditions, especially flow separation, reattachment and boundary layer growth. The visualisation of wear on the hydrofoils was obtained from the wear replicas which were etched on the aluminium rotating disc. Further, to control the wear of these hydrofoils, these were given a hard diffused layer based on boronizing. The performance of these hard diffused layers along with wear prediction on 12Cr and 13Cr4Ni steel hydrofoils are reported in this paper.