Electrolysis and its Mitigation Page: 3
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ELECTROLYSIS AND ITS MITIGATION
By E. B. Rosa and Burton McCollum
CONTENTS
Page
I. Introduction ........................................................ 5
II. General considerations regarding electrolysis ........................... 6
i. Comparison of the electrolysis problem in America with that in
other countries ......................................... 6
2. Electrolytic corrosion proper .................................. 8
3. Self-corrosion ............................................... 10o
4. Troubles from stray currents other than corrosion ................ ii
5. Electrolysis in concrete and in steel buildings. ................... 12
(a) Anode effect ................ ...................... 12
(b) Cathode effect ................. .................... 14
III. Methods of mitigation applicable to pipes. .......................... 15
I. Surface insulation of pipes..................................... 15
(a) Work of previous investigators on paint coatings.......... 16
(b) Materials available for insulation of pipes. ......'........ x17
(c) Tests on pipe coatings .............................. 17
2. Chemical protection. ........................................ 28
3. Cement coatings ............................................ 29
4. Cathodic protection .......................................... 31
5. Favorable location of pipes with respect to tracks. ................ 37
6. Conducting coatings......................................... 39
7. Electric screens ....... .................................... 41
8. Insulating joints in pipes ..................................... 42
(a) General discussion................. .................. ... 42
(b) Tests on insulating joints in service. ..................... 45
(c) Resistance of various types of insulating joints in practice. 52
(d) Number of insulating joints required .................... . 55
(e) Effect of form of joint on distribution of leakage ......... 59
(f) Limiting safe potential drops on insulating joints......... 64
(g) Types of insulating joints available. ..................... 66
(h) Increasing the length of leakage path around joint...... 72
9. Pipe drainage .............................................* 73
(a) Methods of draining pipes ............................. 73
(b) Objections to pipe drainage ............................ 77
io. Summary of discussion of methods of mitigation applicable to
pipes ..................................................... 79
IV. Methods of mitigation applicable to the railway negative return........ 8i
i. Alternating-current systems ................................... 8i
2. Double-trolley systems. ....................................... 82
3. Use of negative trolley....................................... 82
4. Periodic reversal of trolley polarity. ............................ 83
5. Reducing potential differences in the uninsulated portion of the
negative return ............................................ 84
3
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Rosa, Edward B. & McCollum, Burton. Electrolysis and its Mitigation, report, November 25, 1918; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66500/m1/3/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.