Slurry erosion-corrosion resistance and microbial corrosion electrochemical characteristics of HVOF sprayed WC-10Co-4Cr coating for offshore hydraulic machinery

2018 ◽  
Vol 74 ◽  
pp. 7-13 ◽  
Author(s):  
Sheng Hong ◽  
Yuping Wu ◽  
Wenwen Gao ◽  
Jianfeng Zhang ◽  
Yugui Zheng ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Characteristics ◽  
Slurry Erosion ◽  
Microbial Corrosion ◽  
Hydraulic Machinery ◽  
Erosion Corrosion

scholarly journals Effects of Surface Morphology on Erosion–Corrosion and Corrosion Resistance of Highly Hydrophobic Nickel-Tungsten Electrodeposited Film

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1084
Author(s):  
Parinaz Salehikahrizsangi ◽  
Keyvan Raeissi ◽  
Fathallah Karimzadeh ◽  
Luigi Calabrese ◽  
Edoardo Proverbio
Keyword(s):  
Corrosion Resistance ◽  
High Speed ◽  
Sessile Drop ◽  
Electrochemical Impedance ◽  
Initial Contact ◽  
Slurry Erosion ◽  
Corrosion Properties ◽  
Electrodeposited Film ◽  
Erosion Corrosion ◽  
Static Immersion

Hard nanocrystalline Ni-Co or Ni-W coatings are receiving a growing interest owing to their premium hardness, wear, and corrosion properties for several industrial applications. Furthermore, surface hydrophobicity greatly improves surface corrosion resistance. In this research, the durability of hydrophobic hierarchical NiW electrodeposited film has been evaluated in a high-speed slurry erosion–corrosion (EC) test rig. Two different coatings have been tested: a rough coating obtained in a chloride-based bath (NiWchloride) and a smooth coating obtained in a sulfate-based bath (NiWsulfate). Corrosion behavior over time was evaluated by electrochemical impedance spectroscopy (EIS), while surface hydrophobic performance was determined by the sessile drop method. The morphological features of the coatings were assessed by scanning electron microscopy while roughness modification during the EC tests were identified by means of an atomic force microscopy. During static immersion in the aggressive solution, the impedance modulus of the coatings continuously increased due to an increase in the thickness of corrosion products. During the EC test, the impedance modulus of the smooth NiW coating decreased, losing its barrier property. It was observed that the increase in impedance modulus of the hierarchical structure of the rough NiW coating during EC was far greater than that during static immersion. After 64 min of EC, the NiWchloride was able to resume its hydrophobicity property by storing in air; nevertheless, the NiWsulfate, with a loss of approximately 72% in its initial contact angle, was no longer hydrophobic. The results showed improvements in the lifetime of hydrophobic NiW coatings in erosion–corrosion conditions of the hierarchical nanostructure obtained in a chloride-based electroplating bath.

Slurry Erosion–Corrosion Resistance of MoNbTaTiZr High Entropy Alloy

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
A. K. Sharma ◽  
G. Perumal ◽  
H. S. Arora ◽  
H. S. Grewal
Keyword(s):  
Corrosion Resistance ◽  
High Entropy Alloy ◽  
Slurry Erosion ◽  
High Entropy ◽  
Erosion Corrosion

scholarly journals Improvement of Erosion-Corrosion Behavior of AISI 420 Stainless Steel by Ion-Assisted Deposition ZrN Coatings

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1811
Author(s):  
Yuntao Xi ◽  
Lin Wan ◽  
Jungang Hou ◽  
Zhiyong Wang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Small Angle ◽  
Martensitic Stainless Steel ◽  
Multilayer Coating ◽  
Knoop Hardness ◽  
Slurry Erosion ◽  
Aisi 420 ◽  
Erosion Corrosion

In this paper, a pragmatic technique has been developed to evaluate the erosion-corrosion behavior of three kinds of ZrN coatings (i.e., monolayer, multilayer, and gradient layers) which were deposited on AISI 420 martensitic stainless steel using an ion-assisted deposition technology. Among them, the monolayer coating refers to the coating with no change in composition and structure, the multilayer coating refers to the coating with alternating change of Zr/ZrN, and the gradient coating refers to the ZrN coating by increasing N2 partial pressure gradually. The morphology, composition, and microhardness of these ZrN coatings were examined by means of integrating the scanning electron microscopy (SEM), X-ray diffraction (XRD), and Knoop hardness measurements, while anodic polarization tests and salt fog spray tests in a simulated industrial environment have been performed to evaluate and identify the corrosion mechanisms of these coatings. The surface microhardness and corrosion resistance of the AISI420 martensitic stainless steel is found to be significantly improved by depositing the ion-assisted deposition ZrN coatings. The study indicates that the erosion-corrosion behavior in the slurry is the result of the synergistic effect of small-angle erosion and acid solution corrosion. Three ZrN coatings hinder the slurry erosion-corrosion behavior from two aspects (i.e., erosion resistance of small-angle particles as well as corrosion resistance of the substrate), thereby significantly improving the erosion-corrosion resistance of AISI 420 stainless steel. In addition, the ZrN gradient coatings show a much better erosion-corrosion resistance than that of the monolayer/multilayer ZrN coating because they have excellent crack resistance, bearing capacity, and electrochemical performance.

EMPIRE ISO-40

Alloy Digest ◽  
1972 ◽  
Vol 21 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion Cracking ◽  
Heat Treating ◽  
Temperature Performance ◽  
Erosion Corrosion ◽  
Steel Castings

Abstract EMPIRE IS0-40 is a precipitation-hardenable stainless steel for castings resistant to corrosion, stress-corrosion cracking and erosion-corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-278. Producer or source: Empire Steel Castings Inc..

Relationships between Textures and Surface Roughness, Frictional Behavior, Erosion and Corrosion Properties of TiN Films

2004 ◽  
Vol 449-452 ◽  
pp. 781-784 ◽  
Author(s):  
Hee Dong Kim ◽  
In Soo Kim ◽  
Dong Young Sung ◽  
Min Gu Lee ◽  
S. Dost ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Friction Coefficient ◽  
Physical Vapor Deposition ◽  
Textured Surface ◽  
Corrosion Properties ◽  
Tin Films ◽  
Physical Vapor Deposition Method ◽  
Erosion Corrosion ◽  
Better Than

TiN coated films were prepared by a reactive ion physical vapor deposition method. In this research, we studied the relationships between textures and friction coefficient, erosion-corrosion resistance and corrosion resistance in textured TiN films. The surface roughness of (115) textured TiN films is lower than that of (111) textured TiN films. The friction coefficient of (115) textured surface is similar with that of (111) textured surface of TiN coated films. The erosion-corrosion and corrosion resistance of (115) textured surface is better than that of (111) textured surface of TiN coated films.

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