Erosion corrosion of low-alloy wear-resistant steels in alkaline slurry

20th International Scientific Conference Engineering for Rural Development Proceedings

Karpisz

2021

Steel in S235JRC grade is a popular unalloyed steel readily used for various structures, including those working in contact with aggressive media. The corrosion of these steels is easy to control. It is usually superficial. One of the more complex corrosive environments is animal slurry. As a result, the corrosive effects of animal slurry are complex and time varying. Slurry is a mixture of dung and urine. The aggressive corrosive constituents in slurry are urea, uric acid, naturally excreted chloride, as well as ammonia or ammonium salts. The purpose of this article is to investigate corrosion resistance in different time (48, 96, 144, 192, 240, 288, 336, 384-and 432 hours), using weight loss and profile roughness parameters of structural steel in grade S235JRC in natural 80% water solution of animal slurry at room temperature (298 K). Today, corrosion-resistant steels are usually used in aggressive environments. In order to be able to compare the corrosion rate of stainless steel with steel S235JRC, it was decided to carry out the tests based on the methodology of testing corrosion-resistant steels. Corrosion tests show that the tested steel in animal slurry as a corrosive environment is characterized through continuous corrosion process, which measure may be surface roughness. It was found that animal slurry with a room temperature is an aggressive corrosive medium of steel grades S235JRC. A gentle transition between the various stages of corrosion was noted, which is reflected in the surface roughness and corrosion velocity.

Section: Introductionmentioning

confidence: 99%

Effect of 80% water solution of animal slurry on carbon structural S235JRC steel at room temperature

20th International Scientific Conference Engineering for Rural Development Proceedings

Karpisz

2021

“…The H2S is the most corrosive agent that dissolves in moisture films where it undergoes oxidation by aerobic bacteria to very agresive sulphuric acid H2SO4. Penetration corrosion processes of low carbon steel with animal products are very aggressive [5][6][7]. Slurry is a mixture of dung and urine, and farmyard manure and etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Animal Slurry on Carbon Structural S235jr Steel at 318 K

METAL 2020 Conference Proeedings

Karpisz

2020

Carbon steels as a construction materials are still very popular, but exposed to corrosion. Low-carbon steel is often used as a construction material for agricultural equipment. Corrosion is a result of the chemical and electrochemical environment influence on the material. In alloys and metals changes occur as a result of interaction with the surrounding environment. One of the most important factors constructional material is corrosion resistance, first of all in demanding animal environment. Slurry is a mixture of animals dung and urine. The aggressive corrosive constituents in slurry are urea, uric acid, naturally excreted chloride and as well as ammonia or ammonium salts. In practice roughness parameters for every of the research times can be used for determine the size of steel corrosion. Equipment with carbon steel can be easy built by welding quickly at a low price, but biggest problem in aggressive environment is their corrosion protection. The purpose of this article is to investigate corrosion resistance in different time (48, 96, 144, 192, 240, 288, 336, 384 hours) using weight loss and profile roughness parameters of structural steel in grade S235JR in natural animal slurry at 318 K. Corrosion tests show that the tested steel in animal slurry as a corrosive environments is characterized through continuous corrosion process whose measure may be surface roughness.

Section: Introductionmentioning

confidence: 99%

“…The environment, which agricultural machines and devices work in, is classified as very aggressive [29][30][31][32]. The reason for this, among others, is high nitrogen content in the atmosphere and in animal waste, which can form chemical compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Animal products and biological substances are important corrosive environmental factors in agricultural industry. Therefore, corrosion in agricultural industry is very a difficult and also dangerous process [27][28][29][30][31][32].The environment, which agricultural machines and devices work in, is classified as very aggressive [29][30][31][32]. The reason for this, among others, is high nitrogen content in the atmosphere and in animal waste, which can form chemical compounds.…”

mentioning

confidence: 99%

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Corrosion of 1.4110 stainless steel at nitrate acid at 323 K

Kruszewski

Engineering for Rural Development

2018

Abstract. Corrosion is a common process of destroying construction materials. The material during these processes loses its properties, it causes deterioration of functions, loses its usefulness, applicability. One of the important aggressive environments in the agricultural industry is nitrogen, from which nitric acid may be formed. Due to high hardness and also a good resistance to abrasion and corrosion the 1.4110 steel is commonly used in industry as knife blades, machining tools, measuring tools, pump construction, valves. Stainless steel is steel with good resistance to homogeneous or local environmental attack. The aim of the research was to determine the corrosive wear of 1.4110 steel (X55Cr), corrosion resistance with martensitic microstructure using the Huey test. The tested steel contains 0.52 % C, 13.4 % Cr and 0.65 % Mo. The samples were weighed before start of the corrosion processes and after them. Samples were kept in nitric acid 65 % at temperature 323K. The holding times of the samples in nitric acid were 48, 96, 144, 192, 240, 288, 336, 384 hours. The percentage of mass losses was determined by the weight method. Each sample was examined metallographically using an optical microscope and the surface roughness test using a profilometer. The test results were analyzed in order to determine the corrosion rate of steel in mm/year and g/m2 as well as percentage mass loss and determine the corrosion resistance in this environment. After corrosion of the steel, the roughness has increased. Mass loss and corrosion velocity were presented by a linear function, but greater accuracy is obtained by using the 3rd degree polynomial. Then it was confirmed that as the holding time in boiling nitric acid increases, corrosive wear increases. Generally, the tested steel 1.4110 has a good corrosion resistance in the nitricacid environment.Keywords: steel, stainless steel, corrosion, corrosion rate, roughness. IntroductionIn technics corrosion mainly concerns metal materials and within them also iron alloys. Stainless steel is steel with good resistance to homogeneous or local environmental attack. Corrosion-resistant steels created have resistance only in specific conditions [1][2][3][4][5][6][7]. Their corrosion resistance depends i.a. on the chemical ingredients, microstructure, surface condition. Corrosion-resistant steels have at least 10.5 % chromium and a maximum of 1.2 % carbon, elements that conduce to forming of the surface layer (passive), with dense structure and consistent with the base, causing a jump of the chemical potential, it has a tendency to self-rebuilding and provides corrosion resistance. Along with the increasing content of the chromium, nickel, molybdenum the corrosion resistance is gaining. Corrosion is a phenomenon of material damage as a result of the chemical and electrochemical environment influence [8][9][10][11][12].In alloys and metals changes occur as a result of interaction with the surrounding environment. The corrosion process begins at the point of contact with the environme...