Go to GlobalSpec.com Home
Alert   Product Alerts
Keep current on the latest products, new suppliers, and technical articles of interest to you. (See Topics)

Pitting Corrosion of Zirconium 702 in Hot, Dilute Sulfuric Acid Contaminated with Copper

From ATI Wah Chang
 

 

Severe pitting corrosion is zirconium (UNS No. R60702) reboiler tubes was experienced in hot dilute sulfuric acid. The zirconium 702 tubes had operated with no corrosion for several years. In an effort to mitigate corrosion to austenitic stainless steel by organic acids downstream of the reactor, cupric acetate solution was added to the reactor. This resulted in severe pitting to the zirconium 702. The failure was confirmed to be due to the cupric ions in conjunction with residual levels of chlorides in the system which caused the rapid severe pitting to the zirconium 702.

Products & Services
Nonferrous metals and nonferrous alloys are not based on iron and include alloys of aluminum, copper, titanium, zinc, nickel, cobalt, tungsten, precious metals, refractory metals. Learn more about Nonferrous Metals and Alloys
Master alloys and alloying additives are alloy element concentrates, grain refiners, hardeners, deoxidants and other agents added into a melt or metal powder blend to produce a particular alloy, modify a melt or alter processing characteristics. Learn more about Master Alloys and Alloying Additives
Tungsten and tungsten alloys are refractory metal or alloys with a very high melting point and high density. Tungsten and tungsten alloys are used to fabricate light bulb filaments, PVD evaporation crucibles, EDM electrodes, and electrical contacts. Search by Specification | Learn more about Tungsten and Tungsten Alloys
Molybdenum and molybdenum alloys are refractory metal and alloys with a very high melting point and a relatively high density. Molybdenum and molybdenum alloys are used to fabricate PVD evaporation crucibles, electrodes, and electrical contacts. Search by Specification | Learn more about Molybdenum and Molybdenum Alloys
Bimetals and clad alloys consist of two or more different alloy layers that are integrally bonded into a metal plate, strip, sheet, or other stock shape. Learn more about Bimetals and Clad Alloys
Product Announcements
ATI Wah Chang - CPI Zirconium
One of the major applications for Zircadyne® metal is as a structural material in the chemical processing industry. Zircadyne® metal exhibits excellent resistance to corrosive attack in most organic... (read more)
ATI Wah Chang - OmegaBond™ Zirconium and Titanium Tubing
OmegaBond™ products are advanced tubing designs for use in corrosive chemical processes and other applications. OmegaBond™ technology can be applied to the extremely corrosive urea... (read more)
Universal Wire Works Inc. - Low Carbon, Nickel Based Alloy
AWS A5.14 Class ERNiCrMo-4 This alloy is useful for hot metal handling equipment and forging hammers and rings. (read more)
Unique Wire Weaving Company, Inc. - Carpenter 20 Wire Cloth
A special grade of stainless developed for improved resistance to corrosion by sulfuric acid and is widely used thru the chemical industry. (read more)
Unique Wire Weaving Company, Inc. - Carpenter 20 Wire Mesh
A special grade of stainless, Carpenter 20 was developed for improved resistance to corrosion by sulfuric acid, but is widely used throughout the chemical industry. (read more)
Tempco Electric Heater Corporation - Circulation Heaters
Circulation Heaters consist of Screw Plug or Flanged Immersion Heaters, depending on kilowatt rating and size, mated to a pressure vessel. All welded joints on the vessel and heater are hydrostatic... (read more)
Meehanite Metal Corporation - Meehanite Corrosion Resisting Types (C Types)
Type CC is a general utility material providing good corrosive resistance. It can be used for slightly acid solutions, alkali solutions at temperatures up to 150°F and concentrated sulfuric acid at... (read more)
Unique Wire Weaving Company, Inc. - Titanium
Titanium is most commonly woven with commercially pure (C.P.) Grade I wire. Unalloyed titanium shows outstanding resistance to salt water, is virtually immune to atmospheric corrosion, and is highly... (read more)
Unique Wire Weaving Company, Inc. - Monel Wire Cloth
A nickel-copper alloy offers higher strength than unalloyed nickel does not sacrafice ductility and resists corrosion in a broader range of environments including sulfuric acid hydrofluoric acid... (read more)
 
Topics of Interest
4.6 PITTING CORROSION 4.6.1 DEFINITION It is a form of localized corrosion of a metal surface where small areas corrode preferentially leading to the formation of cavities or pits, and the bulk... (Read More)
For more than 30 years, zirconium has been successfully used in hot sulfuric acid tanks for pickling steel. Zirconium is uniquely suited for constructing the heating coils for maintaining the optimum... (Read More)
Tin may be a major impurity in UNS R 60702 or Zr 702. The presence of tin in Zr 702 results from the addition of Zircaloy recycle in the production process. This practice may yield a few benefits,... (Read More)
The synergistic effect between corrosion and wear was determined for zirconium 702 in an aqueous medium. Zirconium 702 with a pickled surface treatment and zirconium 702 with an air oxidized surface... (Read More)
Chloride salt solutions, such as seawater, present a challenging environment for selecting materials with acceptable corrosion resistance. When exposed to these solutions, most metals are susceptible... (Read More)
See more product announcements for Nonferrous Metals and Alloys
NBM Has Sheet & Plate Ready for Immediate Shipment

NBM Has Sheet & Plate Ready for Immediate Shipment
National Bronze & Metals Inc.


Copper Tungsten

Copper Tungsten
Mi-Tech Tungsten Metals, Inc.


WHA - Tungsten Heavy Alloy

WHA - Tungsten Heavy Alloy
Mi-Tech Tungsten Metals, Inc.


11 See more product announcements for Nonferrous Metals and Alloys