Huey test

A suitable volume-to-area ratio is 20 mL (125 mL) of solution/cm" (in ) of specimen surface. This corresponds to the recommendation of ASTM Standard A262 for the Huey test. The preferred vohime-to-... 

This test, which is frequently referred to as the Huey test, was first described and used by W. R. Huey in 1930, and since that time it has had wide application, particularly in the USA. The test consists of exposing the specimens (20-30 cmin fresh boiling 65% HNO3 (constant boiling mixture) for five successive periods of 48 h each under a reflux condenser. The specimens are cleaned and weighed after each period, and the corrosion rate (as a rate of penetration) is calculated for each period of test and for the average over the five periods corrosion rates are expressed as mm/y. The reason for the... 

The H2SO4-CUSO4 test, unlike the Huey test, is specific for susceptibility due to chromium depletion and is unaffected by the presence of submicro-scopic a-phase in stainless steels containing molybdenum or carbide stabilisers. It can be used, therefore, with confidence to test susceptibility in austenic (300 series) and ferritic (400 series) stainless steels and in duplex austeno-ferritic stainless steels such as Types 329 and 326. 

The Huey test is widely used in the USA whilst the H2SO4-CUSO4 test is preferred in the UK, with an increasing tendency to use the metallic copper variant. The H2SO4-CUSO4-CU test procedure is given in BS 5903 1980 (1987). 

The redox potential of the solution is that of the Fe /Fe equilibrium and lies within the range 0-80-0-85 V (v. S.H.E.). The high weight loss of susceptible alloys is due to undermining and grain dislodgement at the sensitised zones, which occurs at about twice the rate of that in the Huey test. Another difference is that whereas in the Huey test corrosion products... 

Austenitic stainless steels-determination of resistance to intergranular corrosion. Part 1 Corrosion test in nitric acid medium by measurement of loss of mass (Huey test) Austenitic stainless steels-determination of resistance to intergranular corrosion. Part 2 Corrosion test in a sulphuric acid/copper sulphate medium in the presence of copper turnings (Moneypenny Strauss test)... 

Huey test Concentrated HNO3 Immersion in boUing solution Mass loss... 

FIG. 2—Typical Huey test apparatus with water-cooied condenser for conducting sample general corrosion (weight-loss) tests up to the solution boiiing point. Samples are typically suspended In the solution by Teflon string or glass rods. 

AFNOR (1998) NF EN ISO 3651-1 1998. Determination of Resistance to Intergranular Corrosion of Stainless Steels. Part 1 Austenitic and Ferritic-Austenitic (Duplex) Stainless Steels. Corrosion Test in Nitric Acid Medium by Measurement of Loss in Mass (Huey Test), AFNOR, Paris. 

Performance of E-BRITE Alloy and Other Stainless Steels in Huey Test ... 

Huey test. It is the nitric acid test described in ASTM A262-68 practice. 

Huey test Corrosion testing in a boiling solution of nitric acid. This test is mainly used to detect the susceptibility to intergranular corrosion of stainless steel. 

The results of Huey tests (ASTM A 262, Practice C) on snbmerged arc welds showed that the corrosion rate increased slightly with arc energy in the studied range of 0.5 to 6.0kJ/mm (13 to 152kJ/inch). For comparison, the corrosion rate for parent metal typically varies between 0.15 and 1.0 mm/y (6 and 40 rmls/y), depending on surface finish and heat-treatment cycle. 

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