Pitting Corrosion Resistance and Inhibition of Lean Austenitic Stainless Steel Alloys

Loto, Roland Tolulope

doi:10.5772/intechopen.70579

Cited by 22 publications

(29 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 9 shows corrosion pits on the flat surface and MG1 after corrosion test. These are metastable pits that usually form at low potentials [31]. In stainless steels, during the early stage of corrosion, chloride ions damage the passive film and promote the nucleation of metastable pits [31].…”

Section: Corrosion Behaviourmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

View full text Add to dashboard Cite

The 304 Stainless Steel (SS304) is severely affected by salt water corrosion due to its high surface wettability. By reducing its surface wettability, its corrosion can be reduced. To achieve this, topographical modification of the steel surface is an effective route. In this work, SS304 flat surfaces were topographically modified into microgrooves (ridge width 250 μm to 500 μm, groove width 200 μm, width ratio = ridge width/groove width >1). Wire cut electrical discharge machining was used to fabricate the microgrooves. Long-term wetting characteristics and long-term corrosion behaviour of flat surface and microgrooves were studied. The influence of the nature of wetting of the tested surfaces on their corrosion behaviour was examined. The sessile drop method and potentiodynamic polarization tests in sodium chloride (3.5 wt. % NaCl) solution (intermittent and continuous exposures for 168 h) were studied to characterize their wetting and corrosion behaviours, respectively. Topographical modification imparted long-term hydrophobicity and, as a consequence, long-term anticorrosion ability of the steel surface. Micropatterning reduced the corrosion rate by two orders of magnitude due to reduction in interfacial contact area with the corrosive fluid via composite wetting, i.e., solid–liquid–air interface. Microgrooves showed corrosion inhibition efficiency ³88%, upon long-term exposure to NaCl solution. By comparing the wetting and corrosion behaviours of the microgrooves with those of the previously studied microgrooves (ridge width/groove width <1), it was found that the surface roughness of their ridges strongly influences their wetting and corrosion properties.

show abstract

Section: Corrosion Behaviourmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…Observation of microstructure with an optical microscope does not indicate information on damage and changes in grain size on the material surface due to the cooling process. Phase analysis (see Figure 2) with X-ray diffraction also does not show the presence of the corrosion product phase identified [8].…”

Section: Crystal Structurementioning

confidence: 93%

“…This super austenitic alloy is a new type of austenitic steel, which contains several alloy elements, such as chrome, nickel, manganese, silicon and carbon. Ti element is added to show relatively better pitting corrosion [7,8], while the elements of phosphor, copper, niobium and sulphur are impurities contained in raw materials. This novelty of steel is designed to be able to be in a high temperature operating environment and also has high corrosion resistance, so that the Cr-Ni content is very extreme, unlike steel in the market (SS-304).…”

Section: Introductionmentioning

confidence: 99%

MICRO-CRYSTAL STRUCTURE OF 57Fe15Cr25Ni0.32Mn0.96Si AUSTENITE STEEL AFTER 850°C-5H TEMPERATURE-QUENCHING TREATMENTS FOR HIGH TEMPERATURE MATERIAL APPLICATIONS

Parikin¹,

Rudi

Sumaryo³

et al. 2018

jsmi

View full text Add to dashboard Cite

MICRO-CRYSTAL STRUCTURE OF 57Fe15Cr25Ni0.32Mn0.96Si AUSTENITE STEEL AFTER 850°C-5H TEMPERATURE-QUENCHING TREATMENTS FOR HIGH TEMPERATURE MATERIAL APPLICATIONS. A serial austenite stainless steel, namely A2-type, has been synthesized by using casting technique at temperature more than 1250 °C in the induction furnace that used an electromagnetic inductive-thermal system. The steel is dedicated for structural component material in multi-purpose applications such as in high-temperature operating environments. So, the material must be resistant to mechanical loads, high temperature, corrosion and irradiation. In order to increase the strength of materials, temperature-quenching treatments are required in some cooling media. Mineral element was extracted from crude ores of Indonesian mines and commercial scrap materials, i.e: ferro scrap, ferro chrome, nickel, manganese, and ferro silicon; all of them in granular shape were prepared to alloy the steel. Titanium was not added to this austenite low carbon steel. The OES-chemical composition in %wt of the materials is 57%Fe, 15%Cr, 25%Ni, 0.34%C and less than 0.1% of impurities that comprised of: titanium, phosphor, copper, niobium and sulphur elements in the steel. X-ray diffraction pattern shows that ascast material had an fcc crystal structure with lattice parameter of 3.632 Å. Meanwhile, two of samples, i.e: annealing and oil quench, have strictly similar lattice parameter to that of air (normalizing) quench (3.580 Å). On the other hand, the lattice parameter of water quenched samples has a slightly lower lattice parameter than the ascast lattice , i.e. 3.587 Å. The peak shift of (111) and (200) -plane in the diffraction profile, is very significant, approximately 0.63 degrees between ascast sample and the last two samples. Ascast microstructure reveals that the austenite phase grains look large and describe an undeformed structure, with an average grain size of about 6 mm, while the annealed sample was larger. Air- and oil- quenched sample microstructures showed a fine grain which was very different to water quenched sample microstructure that showed a coarse grain. The viscousity (h) of the quenching medium had an important role in the formation of grain boundary, because the rate of decreasing temperature was heavily influenced by the diffusion of heat from the high to low temperature spaces.

show abstract

“…Gambar tersebut memperlihatkan bagian permukaan sampel quenching yang dipanaskan pada T = 850°C selama 15 jam lebih mengalami kerusakan dibandingkan dengan sampel as-cast yang dipanaskan pada T = 850°C dengan jangka waktu yang sama. Foto morfologi tersebut cukup memperlihatkan kerusakan permukaan akibat oksidasi [9,10]. Permukaan sampel ascast (Gambar 3(a)) terlihat mulus dan batas poros masih utuh/tidak terkorosi, sedang permukaan sampel quenching (3b) terlihat jelas kerusakan akibat korosi, kerapuhan dan serpihan material (korodan) terdistribusi disekitar posisi porositas.…”

Section: Strukturmikrounclassified

Ketahanan Oksidasi Baja Super Austenitik 15%cr-25%ni Pada Temperatur 850 °c

Parikin¹,

Sugeng

Dani

et al. 2017

jsmi

View full text Add to dashboard Cite

KETAHANAN OKSIDASI BAJA SUPER AUSTENITIK 15%Cr-25%Ni PADA SUHU 850 C. Ketahanan korosi suhu tinggi atau ketahanan oksidasi merupakan prasyarat penting bahan logam yang akan diterapkan dilingkungan operasi bersuhu tinggi. Pengujian ketahanan oksidasi baja super austenitik 15%Cr-25%Ni pada suhu 850 C selama 5 jam lebih telah dilaksanakan. Satu sampel as-cast sebagai acuan awal yang tidak diperlakukan panas dan dua (2) kelompok sampel (masing-masing 3 buah) disiapkan dalam eksperimen. Satu kelompok sampel as-cast setelah dipanaskan (pada 850 C/5 jam lebih) dan didinginkan perlahan kemudian ditimbang. Satu kelompok sampel quench yang dilakukan penurunan cepat suhu (dari 850 C/5 jam lebih) ke dalam air, kemudian ditimbang. Percobaan dilakukan selama 15 jam lebih pada masing-masing kelompok. Hasil memperlihatkan bahwa walaupun terjadi kenaikan berat sangat kecil pada sampel as-cast dan quench, tetapi foto morfologi mikroskop elektron (SEM) pada kedua sampel tersebut tidak memperlihatkan perubahan yang signifikan. Demikian pula hasil analisis fasa menggunakan difraksi sinar-X, tidak memperlihatkan pertumbuhan fasa produk oksidasi. Hasil pengamatan strukturmikro permukaan bahan menggunakan mikroskop optik (MO), juga tidak memperlihatkan kerusakan dan perubahan ukuran butir oleh proses oksidasi. Kebolehjadian pada fenomena ini adalah selain pembentukan spinel unsur Ni diperkuat juga oleh kemampuan unsur Cr untuk membentuk lapisan pasif (Cr 2 O 3) dipermukaan bahan yang sangat besar dengan mengikat unsur O, sehingga bahan mampu menanggulangi produk oksidasi yang sangat kecil. Disimpulkan bahwa baja super austenitik memiliki ketahanan oksidasi yang baik pada suhu 850 C.

show abstract

Pitting Corrosion Resistance and Inhibition of Lean Austenitic Stainless Steel Alloys

Cited by 22 publications

References 68 publications

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

MICRO-CRYSTAL STRUCTURE OF 57Fe15Cr25Ni0.32Mn0.96Si AUSTENITE STEEL AFTER 850°C-5H TEMPERATURE-QUENCHING TREATMENTS FOR HIGH TEMPERATURE MATERIAL APPLICATIONS

Ketahanan Oksidasi Baja Super Austenitik 15%cr-25%ni Pada Temperatur 850 °c

Contact Info

Product

Resources

About