Zirconium tests

A second physical change dilch may occur during the high temoperature portion of the meltdoen Is some alloying of the uranium and zirconium. Tests have been made at teiqperatures up to 1580 C to... 

R. K. McGeary, inM Symposium on Zirconium and Zirconium Alloys, American Society for Testing and Materials, Philadelphia, 1953, p. 168. 

J. Scheme , ASTM Manual on Zirconium and Hafnium, ASTM STP 639, American for Testing and Materials, Philadelphia, 1977. Covers safe handling of hafnium metal. 

Shipment and Storage. The weight per gallon is 5.6 kg. MSG is shipped and stored in 55-gaHon (0.208 m ) steel dmms or 5-gaHon (0.02 m ) steel pads with a polyethylene liner. Anhydrous MSC is also corrosive toward titanium, titanium—palladium, and zirconium as measured in metal strip tests at 50°C. It is classified as a corrosive Hquid. 

It should be noted that swarf from a zirconium-titanium alloy containing approximately 50% by weight of each element is prone to pyrophoricity in air. It has also been reported that when zirconium is welded to titanium, the welded zone is much more sensitive to corrosion than either of the parent metals. If, therefore, it is proposed to use my construction in which zirconium is welded to titanium, caution should be observed in the machining of welds, and the corrosion behaviour of the weld should be checked by prior testing in the environment with which the construction will be employed. 

Finally, perhaps, it should be pointed out that because the behaviour of zirconium is often adversely influenced by the presence of impurities in corrosive environments, corrosion testing prior to use should be carried out in actual plant liquors rather than in purer synthetic solutions. 

Test method for sandwich corrosion test Recommended practice for preparing, cleaning, and evaluating corrosion test specimens Practice for aqueous corrosion testing of samples of zirconium and zirconium alloys Test method for corrosion testing of products of zirconium, hafnium and their alloys in water at 633 K or in steam at 673 K [metric] Recommended practice for conventions applicable to electrochemical measurements in corrosion testing... 

WEB Strontium-90 is a dangerous byproduct of atomic testing because it mimics the action of calcium in the body. It decays in two beta emissions to give zirconium-90 (Nudear mass = 89.8824 g). 

Fig. 6-2. Experimental results, observed arid corrected for background, to test Method III in the case of iron on silver or zirconium. The ordinate is logarithmic. The tungsten-target x-ray tube was operated at 50 kv and 50 ma. (Zemanv and Liebhafsky, J. Electrochem. Soc., 103, 157.)...

The cyclopentadienyl triflate complexes of zirconium and titanium 51 and 52 (Figure 3.7) are also active catalysts [51]. Their activity has been tested in a wide variety of dienes and dienophiles. It is noteworthy that even at low catalyst loadings, rate accelerations between 10 and > 10 times have been observed. No special precautions were taken to dry the solvents or the substrates, in contrast with the traditional Lewis acids which require either predried solvents or high catalyst loadings. 

A solid, encapsulated scale inhibitor (calcium-magnesium polyphosphate) has been developed and extensively tested for use in fracturing treatments [1451-1453]. The inhibitor is compatible with borate- and zirconium-crosslinked fracturing fluids and foamed fluids because of coating. The coating... 

Sequences 246 and 249 were tested for their ability to catalyze hydrolysis while in solution rather than while attached to a support. The Zr4 complex of sequence 246 was found to catalyze the hydrolysis of phosphate ester 243b five times faster than the complex of peptide 249. Since the control complex 249 does not catalyze hydrolysis it appears that the small amount of catalysis that was observed was due to free zirconium metal (Scheme 29). 

Potassium trisiamylborohydride, 20 605 Potassium winchite, 3 289 Potassium-zirconium carbonate, 26 637 Potato branching enzyme, 12 493 Potatoes, citric acid in, 6 632t Potato fungicide, 13 57 Potato starch, 4 724t Potential energy diagrams, 10 118-119 Potential gum test, 12 400 Potentiated toxic effects, 25 214 Potentiometric measurements, 14 612 Potentiometric titrations, 9 585-58 ... 

As was mentioned previously, an effective system, RNDS , has been developed to remove particular impurities from brine used in membrane electrolysis procedures. The basic concept of RNDS is to bring the feed brine into contact with an ion-exchange resin containing zirconium hydroxide for the adsorptive removal of impurities. For the removal of the sulphate ion from brine, commercial plants utilising RNDS are already in service. For the elimination of iodide and silica, pilot-scale testing is being planned. 

Preparation of Zirconium (Hafnium) Bromide (Iodide). To prepare a zirconium (hafnium) halide, use a multisection tube made from refractory glass with a test tube and offtake fused to it (Fig.123). 

When preparing zirconium bromide, place 1-2 g of phosphoric anhydride into test tube 1 and through offtake 2 pour in the amount of... 

When preparing zirconium iodide, take 20% less iodine than the stoichiometric amount. Place the iodine into test tube 1 and spill a mixture of potassium iodide and freshly prepared calcium oxide (2-3 g) onto it. 

Seal off offtake 2 and spill metallic zirconium into section 5 via offtake 6. Tightly close offtake 6 with a rubber stopper. Connect the apparatus via offtake 8 to a vacuum system for 15-20 min. Next place test tube 1 into a Dewar vacuum flask with liquid nitrogen and seal off offtake 6. Perform this work wearing eye protection in the presence of your instructor ) After the pressure in the system becomes equal to 10 mmHg (in about 40-60 minutes), seal off offtake 8. Stop cooling test tube 1 and wait until the apparatus acquires room temperature. 

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