Corrosion Behavior of High-Nickel and Chromium Alloys in Natural Baltic Seawater

Birn, J.; Janik‐Czachor, M.; Wolowik, A.; Szummer, A.

doi:10.5006/1.3283934

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Substrat yang berbeda memiliki karakteristik yang berbeda pula dimana baja karbon rendah dengan komposisi karbon kurang dari 0,3% memiliki kekerasan dan kekuatan yang tinggi dibandingkan dengan baja tanpa kandungan karbon [7][8] . Nikel krom adalah perpaduan antara nikel dan krom yang memiliki ketahanan yang sangat baik terhadap oksidasi dan korosi suhu tinggi serta ketahanan aus yang baik [9] , sedangkan hastealloy C-276 adalah paduan nikel-molibdenum-kromium yang dirancang untuk memiliki ketahanan korosi yang sangat baik untuk diterapkan di lingkungan yang ekstrim [10][11] .…”

Section: Pendahuluanunclassified

Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF[Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique]

Desiati¹,

Sugiarti²,

Junianto³

et al. 2017

metal.

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IntisariTelah dilakukan karakterisasi strukturmikro dan kekerasan mikro pada lapisan NiCoCrAlY yang dideposisikan di atas substrat yang berbeda yaitu baja karbon, nikel krom dan hastealloy. Lapisan NiCoCrAlY dideposisikan menggunakan teknik penyemprotan HVOF (high velocity oxy fuel). Proses karakterisasi dan pengukuran dilakukan pada seluruh lapisan dengan irisan melintang. Karakterisasi strukturmikro diamati dengan menggunakan mikroskop optik dengan perbesaran 40x. Selanjutnya untuk pengukuran kekerasan menggunakan kekerasan mikro dengan beban 300 gf selama 13 detik. Data pengujian kekerasan diperoleh dengan mengukur nilai rata-rata dari 3 posisi uji kekerasan pada masing-masing bagian substrat sebelum dilapisi, setelah dilapisi dan lapisan NiCoCrAlY. Berdasarkan hasil karakterisasi strukturmikro diketahui bahwa lapisan NiCoCrAlY berhasil terdeposisi dengan ketebalan 370,76 µm, 92 µm, dan 115,73 µm masing-masing di atas substrat baja karbon, nikel krom dan hastealloy. Morfologi permukaan lapisan menunjukkan bahwa lapisan yang terdeposisi tidak begitu rata dan masih tampak adanya pori atau lubang di area lapisan NiCoCrAlY yang terbentuk. Porositas dari lapisan sangat berpengaruh pada sifat mekanik, semakin tinggi persentase porositas lapisan maka kekerasan akan menurun. Nilai kekerasan lapisan NiCoCrAlY pada substrat baja karbon adalah sebesar 349,95 HV, nikel krom sebesar 315,60 HV dan hastealloy sebesar 311,30 HV. Jarak dengan interface mempengaruhi pengukuran kekerasan. Semakin dekat dengan interface akan semakin menurun nilai kekerasaannya. Hal ini dipengaruhi oleh daerah interdifusi elemen pelapis sehingga mempengaruhi kekuatan mekaniknya.

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Section: Pendahuluanunclassified

Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF[Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique]

Desiati¹,

Sugiarti²,

Junianto³

et al. 2017

metal.

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“…However, a few studies were performed to investigate the influence of coexisting chlorides on the chlorine corrosion of Ni-based alloys. 9 , 10 Thus, this effect was studied in this work. Actually, it was found that the coexisting chloride such as NaCl catalyzed and accelerated the hot chlorination corrosion of metallic nickel and thus enhanced the chlorination percentage significantly based on this work.…”

Section: Introductionmentioning

confidence: 99%

“…These issues have stimulated the metallurgists to explore the appropriate alloying elements in the Ni-based alloys, which can lead to alloy property improvements in chemical resistance to chlorine corrosion in the presence of chlorides at high temperatures. However, a few studies were performed to investigate the influence of coexisting chlorides on the chlorine corrosion of Ni-based alloys. , Thus, this effect was studied in this work. Actually, it was found that the coexisting chloride such as NaCl catalyzed and accelerated the hot chlorination corrosion of metallic nickel and thus enhanced the chlorination percentage significantly based on this work.…”

Section: Introductionmentioning

confidence: 99%

Hot Chlorination Corrosion of Metallic Nickel by Chlorine Catalyzed by Sodium Chloride

Chen

Shen

et al. 2020

ACS Omega

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Reducing chlorine corrosion to metals at high temperatures is a big problem for many industrial processes. Some high Ni alloys such as Hastelloy C-276 (Ni > 50 wt %) have been widely used for this purpose. Chlorine and chlorides often coexisted in many industrial processes at high temperatures, such as some industrial incinerators and metallurgical furnaces. Thus, a comprehensive experimental investigation regarding the effect of NaCl on the chlorination corrosion of metallic nickel powder by chlorine at a high temperature was performed. It was more convenient to investigate the intrinsic chlorination mechanisms and kinetics of metallic Ni if Ni powder was used instead of a Ni plate. It was found that there existed a critical chlorination temperature of 450 °C for relative safe use of Ni-based alloy in the presence NaCl. The Ni chlorination in the presence of NaCl was increased with increasing temperature and reached a maximum of 97% at 700 °C, which was about 21% higher than that in the absence of NaCl. An anhydrous NiCl 2 was initially formed at about 700 °C during the chlorination process and then immediately reacted with NaCl to form a novel eutectic complex with a flaky shape, a melting point of 585 °C, and a simplified molecular formula of NiNa 0.33 Cl 2.33 based on X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electronic microscopy (SEM), and chemical analysis with inductively coupled plasma atomic emission spectroscopy (ICP-AES). As a result, only the complex of NiNa 0.33 Cl 2.33 and NaCl was left in the chlorinated product. At 700 °C, the chlorinated product evaporated only in the form of complex NiNa 0.33 Cl 2.33 instead of individual NiCl 2 or NaCl. The chlorination mechanisms of metallic Ni at a high temperature, for example, 700 °C, in the presence of NaCl were as follows. Step 1: Formation of initial chlorinated solid product NiCl 2 (mp 1001 °C) at a high temperature; step 2: The NiCl 2 reacted with solid additive NaCl (mp 801 °C) to form a final liquid product NiNa 0.33 Cl 2.33 (mp 585 °C); step 3: External Cl 2 (g) was dissolved in the liquid product layer; step 4: The chlorine dissolved in the liquid product of NiNa 0.33 Cl 2.33 reacted with the unreacted Ni core. The external Cl 2 (g) passed through the liquid product NiNa 0.33 Cl 2.33 layer faster than the solid product NiCl 2 layer formed in the absence of NaCl. This resulted in 21% more chlorination corrosion of metallic Ni powder with NaCl addition than that without NaCl addition.

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Localized Corrosion Characteristics of Nickel Alloys: A Review

Klapper

Zadorozne

Rebak

2017

Acta Metall. Sin. (Engl. Lett.)

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Corrosion Behavior of High-Nickel and Chromium Alloys in Natural Baltic Seawater

Cited by 5 publications

References 14 publications

Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF[Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique]

Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF[Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique]

Hot Chlorination Corrosion of Metallic Nickel by Chlorine Catalyzed by Sodium Chloride

Localized Corrosion Characteristics of Nickel Alloys: A Review

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