The Significance of Acceptance Test Results

Tipton, Harold F.

doi:10.1007/978-1-349-01921-2_13

Proceedings of the Fourteenth International Machine Tool Design and Research Conference 1974

DOI: 10.1007/978-1-349-01921-2_13

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The Significance of Acceptance Test Results

Harold F. Tipton¹

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2003

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“…This uses chronoamperometry 9 to give direct measurements of the physical parameters which characterize ECM i.e., electrolyte conductivity, overpotential, and workpiece valency. [10][11][12][13][14] A segmented tool is used 15 each electrode of which provides in-line information on these ECM parameters at a specified point along the flow path length, while electrolyte sampling ͑during ECM͒ along the flow path length provides corresponding chemical information.…”

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confidence: 99%

The Electrochemical Machining Characteristics of Stainless Steels

Mount¹,

Howarth²,

Clifton

2003

J. Electrochem. Soc.

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A systematic study of a variety of stainless steels ͓SS316, SS410, Jethete ͑J͒, Duplex ͑D͒, and Super Duplex ͑SD͔͒ has been performed, measuring their electrochemical machining ͑ECM͒ characteristics in chloride and nitrate electrolytes. Theoretical current/time analysis using a segmented tool was used to determine the dissolution valencies, n, and overpotentials, V 0 , along the flow path length. Electrolyte samples from the interelectrode gap, taken at intervals along the flow path, and the bulk were analyzed for conductivity, pH, and visible absorption. The results indicate that the ECM dissolution characteristics of stainless steels are controlled by the surface oxide structure, which is primarily determined by the chromium content. Typically, the high chromium steels D and SD were found to machine with high primary elemental valencies ͑consistent with n Fe ϭ 3 and n Cr ϭ 6), resulting in the production of soluble CrO 4 2Ϫ . However, for the low chromium steels J and SS410, low valency dissolution ͑consistent with n Fe ϭ 2, n Cr ϭ 3) occurred with chloride electrolyte, and this was also found for the intermediate chromium steel SS316 at low electrolyte flow and recycled electrolyte. These results have been explained by the disruption caused to the surface barrier oxide layer by chloride ions and solid ECM products, which allow low valency dissolution to take place. Significant accumulation of these products occurred when performing electrolyte recycling, which is commonly used in industry.

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mentioning

confidence: 99%

The Electrochemical Machining Characteristics of Stainless Steels

Mount¹,

Howarth²,

Clifton

2003

J. Electrochem. Soc.

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The Significance of Acceptance Test Results

Cited by 1 publication

References 1 publication

The Electrochemical Machining Characteristics of Stainless Steels

The Electrochemical Machining Characteristics of Stainless Steels

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