Hot corrosion damage mechanism of Ti6Al4V alloy in marine environment

Vacuum ◽  
2021 ◽  
pp. 110350
Author(s):  
Hulin Wu ◽  
Ping Gong ◽  
Suying Hu ◽  
Lin Xiang ◽  
Enlei Wang ◽  
...  
Keyword(s):  
Marine Environment ◽  
Hot Corrosion ◽  
Corrosion Damage ◽  
Damage Mechanism ◽  
Ti6al4v Alloy

scholarly journals Corrosion Damage Mechanism of TiN/ZrN Nanoscale Multilayer Anti-Erosion Coating

Coatings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 400 ◽  
Author(s):  
Mingrui Geng ◽  
Guangyu He ◽  
Zhiping Sun ◽  
Jiao Chen ◽  
Zhufang Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Salt Spray ◽  
Corrosion Damage ◽  
Damage Mechanism ◽  
Element Distribution ◽  
Salt Spray Corrosion ◽  
Corrosion Tests ◽  
Engine Compressor ◽  
Aero Engines

TiN/ZrN multilayers can effectively improve the erosion resistance of metals, particularly titanium alloys employed in aero engines. To explore the corrosion damage mechanism of TiN/ZrN nanoscale multilayers (nanolaminate), a novel [TiN/ZrN]100 nanolaminate coating was deposited on Ti-6Al-4V alloys by multi-arc ion plating method. Salt spray corrosion tests and hot corrosion experiment were carried out to evaluate the corrosion resistance of the coating. The corrosion and damage mechanisms were explored with the help of detailed microstructure, phase composition and element distribution characterizations. The salt spray corrosion tests showed that the [TiN/ZrN]100 nanolaminate coating possessed good corrosion resistance, which protected substrate against the corrosion. The low temperature hot corrosion tests showed that the oxidation occurred on the surface of the coating, which improved the oxidation resistance of the sample. However, the oxidized droplets squeezed the coating, and destroyed the oxidized layers. As a result, the coating was peeled off from the substrate. The research highlights the corrosion resistance of the novel TiN/ZrN nanolaminate coating and offers a support for their application in engine compressor blade.

Study on Corrosion Damage Rule for Two Type of Aluminum Alloy

2014 ◽  
Vol 599-601 ◽  
pp. 111-113
Author(s):  
Dan Feng Zhang ◽  
Xiao Ming Tan ◽  
Dan Gui Zhang ◽  
Fang Zhang ◽  
Wei Zhang
Keyword(s):  
Aluminum Alloy ◽  
Statistical Analysis ◽  
Marine Environment ◽  
Corrosion Test ◽  
Corrosion Damage ◽  
Aircraft Structure ◽  
Accelerated Corrosion ◽  
Damage Repair ◽  
Accelerated Corrosion Test ◽  
Damage Rule

Corrosion exists everywhere. It’s very widespread that the aluminum alloy aircraft structure suffers the corrosion damage under the marine environment particularly. The equivalent accelerated corrosion test of the new aluminum alloy 2B06 and 7B04 was carried out.Corrosion damage was inspected and measured through microscope. The rule of the corrosion damage can be obtained by statistical analysis. And which can supply the reference basis for the corrosion damage repair and evaluating the calendar life.

scholarly journals Research on the Corrosion Damage Mechanism of Concrete in Two Freeze–Thaw Environments

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xianhua Yao ◽  
Min Zhang ◽  
Junfeng Guan ◽  
Lielie Li ◽  
Weifeng Bai ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Erosion Resistance ◽  
Corrosion Damage ◽  
Damage Mechanism ◽  
Resistance Coefficient ◽  
Dynamic Elastic Modulus ◽  
Freeze Thaw ◽  
Environment Temperature ◽  
Performance Deterioration ◽  
Air Void

This study aims to investigate the effects of two freeze–thaw environments (i.e., maintenance freeze-thaw (MFT) environment and immersion freeze-thaw (IFT) environment) on the durability performance, deterioration rules, and mechanisms of concrete. In MFT, the concrete specimens were firstly cured in the standard curing environment (temperature, 20 ± 3, humidity, not less than 95%, and ages, 28 d) and then were carried out in freeze–thaw environment, while in IFT, the concrete specimens were firstly cured in the salt (NaHCO3, NaCl, and Na2SO4) immersion environment for 90 d and then were carried out in freeze–thaw environment. In this study, the damage features, relative dynamic elastic modulus, mass changes, and erosion-resistance coefficient of concrete have been measured. Thereafter, using the scanning electron microscopy (SEM) and the mercury intrusion porosimetry (MIP), the air-void structure parameters and the microstructures have been measured, respectively. The results show that the relative dynamic elastic modulus and the erosion-resistance coefficient of the compressive strength of the concrete in the IFT environment are, respectively, 14.3% and 21.0% higher than those of the concrete in the MFT environment. In addition, the results of the microstructure analyses show that the corrosion damages of the concrete are mainly caused by the combined action of the corrosion products of ettringite and freeze–thaw environment. However, the damage to the concrete in the MFT environment is more serious than that in the IFT environment. The results of the MIP analysis show that the harmful pore value for the concrete in the MFT environment is almost two times larger than that for the concrete in the IFT environment.

Investigation on Material under Accelerated Simulator Environment in Laboratory and Tropical Marine Environment of Aircraft Structure

2011 ◽  
Vol 236-238 ◽  
pp. 2619-2625
Author(s):  
Yue Liang Chen ◽  
Jian Jun Hu ◽  
Gui Xue Bian ◽  
Yong Zhang ◽  
Hao Luo
Keyword(s):  
Mass Loss ◽  
Marine Environment ◽  
Base Material ◽  
Corrosion Damage ◽  
Aircraft Structure ◽  
Corrosion Characteristic ◽  
Accelerated Corrosion ◽  
Corrosion Depth ◽  
Ocean Environment ◽  
Damage Characteristic

The important factors induced corrosion damage of aircraft are analyzed. Based on airport ground environment spectrum, the LY12CZ specimens are tested in laboratory using the accelerated corrosion spectrum. Some specimens are exposed on deck in tropical marine environment. The corrosion characteristic of the coating and base material is inspected and corrosion damage size is measured after the specimens have been accelerated corrosion tested for 5,10,15,20 and 30 years respectively and the specimens have been exposed on deck. The corrosion characteristic of specimens are analyzed and compared using several evaluating indicator. The results show that the corrosion damage characteristic of the specimen in the test is consistent with which in service situations. And the corrosion of material exposed in ocean environment is obviously accelerated. The corrosion depth is measured and the mass loss by corrosion is weighed. The distribution function of the corrosion depth and the characteristic of the mass loss by corrosion are given. The corrosion equivalent relationship under these two environments is determined by contrasting the corrosion depth and the corrosion characteristic.

Failure Analysis of α-MDEA Air-Cooled Heat Exchanger of CO2 Removal Unit Based on the Semiquantitative Risk-Based Inspection Method

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Hamid Reza Lashgari ◽  
Amir Hanaei ◽  
A. R. Adeli
Keyword(s):  
Corrosion Damage ◽  
Damage Mechanism ◽  
Co2 Corrosion ◽  
Failure Behavior ◽  
Co2 Removal ◽  
Inspection Planning ◽  
Inspection Method ◽  
Calculation Results ◽  
Mitigation Methods ◽  
Air Cooled Heat Exchanger

Risk-based inspection program (RBI) is a decision making techniques for providing refineries and petrochemical plants with an effective and appropriate inspection planning. The aim of the present study is to analyze failure behavior and risk ranking of α-MDEA fin/fan cooler of CO2 removal unit based on API 581 in order to find out the reason(s) of tubes failure. According to previous experience in similar plant, risk calculation results and conducted inspection activity by using RFT eddy current technique, CO2 corrosion damage mechanism was identified as a main reason of tubes failure. In next step, process key variable, prevention/mitigation methods and inspection planning programs were determined so as to minimize the similar failure behavior in the rest of the lean amine air-cooled heat exchangers of CO2 removal unit.

Development of the General Electric LM 1500 Gas Turbine as a Marine Power Plant

1966 ◽  
Vol 88 (2) ◽  
pp. 144-152
Author(s):  
E. E. Stoeckly
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Marine Environment ◽  
Hot Corrosion ◽  
Power Plants ◽  
Sea Salt ◽  
Marine Propulsion ◽  
Performance Deterioration ◽  
Aircraft Type ◽  
And Performance

Many unique advantages have stemmed from the use of aircraft-type gas turbine power plants in selected marine propulsion applications; and, as expected, special problems have arisen because of the marine environment, primarily in the areas of parts integrity resulting from cold and hot corrosion and performance deterioration due to compressor fouling. Sulfur in the fuel, together with sea salt in the fuel and combustion air, creates major problems. Programs directed to reduce the detrimental effects, and the results attained are described.

Analysis of Concrete Corrosion and Damage Mechanism under the Actions of Multiple Salts and Dry-Wet Cycles

2014 ◽  
Vol 578-579 ◽  
pp. 1477-1481
Author(s):  
Xiao Ping Su
Keyword(s):  
Chemical Composition ◽  
Energy Spectrum ◽  
Corrosion Damage ◽  
Damage Mechanism ◽  
Composition Analysis ◽  
Concrete Durability ◽  
Chemical Attack ◽  
Concrete Corrosion ◽  
Concrete Damage ◽  
Corrosion Mechanisms

On the basis of concrete durability experimental results under the actions of multiple salts and dry-wet cycles, the internal microstructures of concrete subjected to the corrosion damage are studied in this article. The EDX energy spectrum analysis and chemical composition determination are discussed, and the concrete corrosion mechanisms under the actions of multiple salts and dry-wet cycles are studied further. The results indicate that the internal microstructures of ordinary concrete and fly ash concrete in the multi-salt solution are loose and porous after dry-wet cycles. There are a lot of crystals gathering in the concrete cracks. Through the EDX energy spectrum and chemical composition analysis, the main composition in them is CaCO3, doping with a small amount of Na2SO4, Na2CO3, or NaHCO3, etc. While the internal structure of air-entraining concrete is not only relatively dense, but also corroded by multiple salts. Under the condition of dry-wet cycles, the concrete damage by salt corrosion is a complicated process which including both chemical attack and physical function, and the damage speed and degree to crystallization corrosion by salts is quicker and even more serious than that of the chemical erosion.

scholarly journals The Control of Hot Corrosion in Marine Gas Turbines

1980 ◽  
Author(s):  
J. F. G. Condé ◽  
C. G. McCreath
Keyword(s):  
Hot Corrosion ◽  
Gas Turbines ◽  
Erosion Resistance ◽  
Stress Rupture ◽  
Corrosion Damage ◽  
Sea Salt ◽  
Control Procedure ◽  
Creep And Stress Rupture ◽  
Temperature Levels ◽  
Rupture Behavior

Ingestion of sea salt and sulphur from fuel can lead to aggressive environments in gas turbines operating in marine conditions resulting in corrosion damage to hot end components, even in well-filtered engines. The nature of the environment in the engine and the factors which influence this are indicated. The chemistry of salt contaminant particles in the engine and combustion environments and temperature levels prevailing in naval engines are described in relation to the normal operating profile and the incidence of corrosion effects in relation to temperature. Results of rig evaluation of materials and coatings are given. Erosion resistance, the combined effects of erosion/corrosion and the mechanisms of hot corrosion are discussed together with the effects of material composition and the use of inhibition as a control procedure. The effects of a salt environment on the creep and stress-rupture behavior of superalloys are covered briefly.

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