The Use of Sodium Dichromate Pretreatment for Enhanced Marine Corrosion Resistance of C70600

CORROSION ◽  
1983 ◽  
Vol 39 (9) ◽  
pp. 371-376 ◽  
Author(s):  
T. S. Lee
Keyword(s):  
Corrosion Resistance ◽  
Sodium Dichromate ◽  
Marine Corrosion

New high-strength, corrosion-resistant alloys for marine corrosion, fastener and boat shaft applications

2012 ◽  
Author(s):  
Edward Hibner ◽  
Pete Jones
Keyword(s):  
Corrosion Resistance ◽  
Hydrogen Embrittlement ◽  
Yield Strength ◽  
Cold Work ◽  
High Strength ◽  
Age Hardening ◽  
Marine Corrosion ◽  
Corrosion Resistant ◽  
Excellent Corrosion Resistance ◽  
Cold Worked

High strength and corrosion resistant nickel alloys Hastelloy C-86 ® (UNS N06686) and Hastelloy C-22HS ® (UNS N07022) are currently being evaluated and/ or used by the Navy for current and future bolting applications where both high strength, toughness, ductility along with excellent resistance to corrosion and hydrogen embrittlement are required. This includes present and new ship design. The 686 alloy is currently into final stages of data gathering and mil spec preparation. Alloy 686 is a solid solution nickel base alloy obtaining it’s strength through cold work. The C-22HS alloy was recently introduced for applications requiring both corrosion resistance and high strength. Being a C-type alloy (Ni-Cr-Mo), C- 22HS has excellent corrosion resistance in both reducing and oxidizing environments. The alloy is capable of being age-hardened to effectively double the yield strength over other Ctype alloys. The C-22HS alloy has generated interest in the oil & gas industry due to its resistance to sour brine environments. C-22HS is being included in NACE MR0175/ISO 15156 at NACE Level VII (highest severity), exhibiting resistance to severe sour brine environments. Properties of the new alloy relevant to marine corrosion and Navy fastener applications are presented. This material has also been shown to be resistant to hydrogen embrittlement in marine and other severe environments, exhibiting potential for corrosion immunity. Efforts in developing alternate processing routes for C-22HS alloy for very high strength applications are detailed. The high strength of C-22HS alloy is imparted through the formation of Long Range Ordering (LRO) domains of Ni2(Cr, Mo) which develop during a two-step age-hardening treatment. In standard C-22HS alloy, the formation of the LRO domains nearly doubling of the room temperature yield strength up to values around 100 ksi. The yield strengths of the as-cold worked bars ranged from 191 to 205 ksi (1317 to 1413 MPa), and the cold-worked + age-hardened bars ranged from 199 to 206 ksi (1372 to 1420 MPa). In these material conditions, C-22HS also exhibits excellent ductility and fracture toughness of _150 ft-lbs (_203 J) from -300ºF to +550ºF (-149 to 288°C). The C - 22HS alloy is presently being tested for Navy Subsafe high strength fastener approval. An important feature of the C-22HS alloy in the age-hardened condition is that the alloy retains excellent corrosion resistance. Both alloys C-86 and C-22HS have excellent potential for all marine and military applications where excellent strength, toughness and corrosion resistance are required. In addition to the nickel alloy just discussed, NITRONIC® 50HS (UNS S20910) Stainless Steel provides a combination of corrosion resistance and strength not found in any other commercial material available in its price range. As a result, the use of this alloy for boat shafting is significantly increasing for commercial and naval shipping. Superior corrosion resistance, high yield strength, exceptionally low magnetic permeability and outstanding cryogenic properties define this alloy usefulness for boat shafting.

Mechanical Properties and Marine Corrosion Resistance of P-Bearing ULCB Steels

2010 ◽  
Vol 654-656 ◽  
pp. 378-381 ◽  
Author(s):  
Wen Fang Cui ◽  
Chun Ming Liu ◽  
Si Xun Zhang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Strengthening Effect ◽  
Marine Corrosion ◽  
Immersion Corrosion ◽  
P Content ◽  
Temperature Impact ◽  
Solution Strengthening ◽  
Low Temperature Impact Toughness ◽  
Inner Scale

The research aims to evaluate the microstructure, mechanical properties and marine corrosion resistance of P-bearing ULCB steels. P produced stronger solution strengthening effect, but had less effect on the low temperature impact toughness of ULCB steel. With increasing P content to 0.09(mass)%, the immersion corrosion rate of ULCB steel in 3.5% NaCl obviously decreased in comparison with those steels without or with lower P content. This is attributed to that the complex effect of Cu and P promoted the formation of dense amorphous oxyhydroxide in the inner scale, which inhibited further corrosion from NaCl solution. Mo in ULCB steel played an important role in avoiding pitting corrosion in Cl- environment.

Improving the Corrosion Resistance of API X56 and API X70 Pipeline Steels by Hot Dip Aluminization

2021 ◽  
Vol 875 ◽  
pp. 315-321
Author(s):  
Muhammad Ramzan Abdul Karim ◽  
Sanam Daniel ◽  
Ehsan Ul Haq ◽  
Akhlaq Ahmad ◽  
Khurram Imran Khan ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Internal Surface ◽  
Passive Layer ◽  
Material Loss ◽  
Pipeline Steels ◽  
Marine Corrosion ◽  
Weight Loss Method ◽  
Loss Method ◽  
Steel Substrates ◽  
Sweet Corrosion

The external surface of the pipeline steels can be protected from corrosion by cathodic protection and a suitable coating system. But to protect the internal surface of steel pipelines from corrosion is always a challenge. In the current study, a protective aluminum coating was applied on the internal surface of steel pipeline grades API X56 and API X70 by hot dip aluminization process to minimize the cost of inhibitors. The steel substrates were dipped in the hot aluminum bath, whose temperature was maintained at 720 °C, for three different dipping times (5, 7.5 and 10 minutes) and then permitted to cool to room temperature. The coated specimens were characterized in terms of their structure and composition by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM micrographs analysis reveal that the hot dip aluminized specimens gave an unwavering and well adherent interface which is essential for corrosion resistance of the substrates. The corrosion behavior was evaluated by weight loss method in case of sweet corrosion (in 1.0 % NaCl + CO2 environment) and, by electrochemical potentiodynamic polarization tests for marine corrosion (in 3.5% NaCl environment). The sweet corrosion rates showed severe material loss (14.17 mpy for API X56 and 6.6 mpy in case of API X70) of uncoated samples as compared to the aluminized samples which showed no corrosion at all even after one week due to the passive layer of Al2O3. Whereas the marine corrosion of aluminized specimens was also reduced to 0.11 mpy (coated specimens) from 0.57 mpy (uncoated specimens).

Relationship Between Microstructure and Marine Corrosion Resistance of Martensitic Stainless Steels: A Multiscale Approach

2019 ◽  
Vol 28 (6) ◽  
pp. 3785-3802
Author(s):  
Pierre Reilhac ◽  
Juan Creus ◽  
Xavier Feaugas ◽  
Grégory Michel ◽  
Simon Frappart ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Multiscale Approach ◽  
Marine Corrosion ◽  
Martensitic Stainless Steels

Corrosion Resistance of Si and Al-Bearing Ultrafine Grained Weathering Steel

2005 ◽  
Vol 475-479 ◽  
pp. 55-60 ◽  
Author(s):  
Toshiyasu Nishimura
Keyword(s):  
Corrosion Resistance ◽  
Low Frequency ◽  
Complex Oxides ◽  
Complex Oxide ◽  
Frequency Region ◽  
Weathering Steel ◽  
Marine Corrosion ◽  
Continuous Formation ◽  
Corrosion Reaction ◽  
Ultrafine Grained

The iron rust phase has been analyzed by using EPMA, TEM and EIS after simulating marine corrosion tests. The ultrafine grained (UFG) weathering steel containing Si and Al showed higher corrosion resistance than carbon steel in the test. Si and Al were identified as Si 2+ and Al 3+ in the complex oxide of inner rust by EPMA and TEM. It was demonstrated by EIS that the resistance at the low frequency region corresponded to that of corrosion reaction of rusted steels (Rt). The Rt value of this steel increased after the continuous formation of inner rust, which implied that Si and Al took part in the conversion of complex oxides into fine structure that prevented the penetration of Cl ions.

scholarly journals Marine corrosion resistance of CeO2/Mg(OH)2 mixed coating on a low alloyed steel

2019 ◽  
Vol 372 ◽  
pp. 410-421 ◽  
Author(s):  
K. Aggoun ◽  
L. Chaal ◽  
J. Creus ◽  
R. Sabot ◽  
B. Saidani ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Alloyed Steel ◽  
Marine Corrosion ◽  
Low Alloyed Steel

Marine Engineering Steels – Properties Requirements and Evaluation

2014 ◽  
Vol 692 ◽  
pp. 465-469
Author(s):  
Jian Xun Fu ◽  
Le Chen ◽  
Chang Jin Wu ◽  
Yan Xin Wu
Keyword(s):  
Corrosion Resistance ◽  
Design Theory ◽  
Galvanic Corrosion ◽  
High Strength ◽  
Uniform Corrosion ◽  
Marine Corrosion ◽  
Reliability Design ◽  
Engineering Steel ◽  
Marine Engineering ◽  
Strength And Plasticity

With the implementation of China's maritime strategy, the demand for marine engineering steel is increasing sharply. Due to the harsh service conditions of marine engineering steel, there are strict requirements in corrosion resistance, structural toughness, welding property, high strength and cold tolerance. This paper introduces the corrosion resistance, structural toughness and welding property of marine engineering steel in detail. Marine corrosion could be divided into uniform corrosion, pitting, crevice corrosion, impact corrosion, cavitation corrosion, galvanic corrosion, corrosion fatigue, etc. The conventional means to improve the corrosion resistance of marine engineering steel are coating, cathodic protection and improving the corrosion resistance of the steel itself. Toughness is a comprehensive embodiment of strength and plasticity. When the toughness is too low, the safety and service life decrease, while cost increase when the toughness is too high. The actual structures toughness can be reflected from the CTOD test. Welding is the most important process of marine engineering steel. The excellent design of fracture mechanics of welded joints and the reliability design theory can greatly enhance the reliability of marine engineering steel.

Advanced Corrosion Resistant Nickel-Alloys for Marine Applications, Including Cryogenic Service

2014 ◽  
Author(s):  
Edward L. Hibner ◽  
Pete Jone
Keyword(s):  
Corrosion Resistance ◽  
Yield Strength ◽  
High Strength ◽  
Fast Response ◽  
High Yield ◽  
Marine Corrosion ◽  
Price Range ◽  
Superior Corrosion Resistance ◽  
Marine Applications ◽  
Corrosive Environments

HASTELLOY® alloys C-86 and C-22HS are currently being used or evaluated by the Navy bolting applications where both high strength, toughness, ductility, resistance to corrosion and hydrogen embrittlement are required. Alloys C-86 and C-22HS have been used in severe applications that require both corrosion resistance and high strength and C-22HS has properties applicable to cryogenic service. Alloy C-22HS is included in NACE MR0175/ISO 15156 exhibiting resistance to extremely severe corrosive environments. Properties of these alloys relevant to marine corrosion and Navy fastener applications are presented. The alloy C-22HS yield strength ranges from 191 to 205 ksi (1317 to 1413 MPa). AlloyC-22HS also exhibits excellent ductility and fracture toughness of ≥150 ft-lbs (≥203 J) from -300ºF to +550ºF (-149 to 288°C). Superior corrosion resistance, high yield strength, low magnetic permeability and outstanding cryogenic properties define C-22HS alloy usefulness. NITRONIC® 50HS (UNS S20910) Stainless Steel provides a combination of corrosion resistance and strength not found in any other commercial material available in its price range. As a result, the use of this alloy for boat shafting is significantly increasing for commercial and naval shipping. NITRONIC 50HS is currently used by the USCG for shafting on the Fast Response Cutter.

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