Table 89. Corrosion of Wire Ropes 



Rope 



No. 



..o/ 



Coating 



Diameter 

 (in.) 



Construction 



Stress 

 on Rope 



(lb) 



Exposure 

 (day) 



Depth 



(ft) 



Breaking Load 



Remarks 



(lb) 



Final 

 (lb) 



% Change 



1 



Plow steel 



lubricated 



0.875 



7x 19 







123 



6,000 



48,200 



48,200 







Rust on crowns of outside wires; lubricant still in grooves-, 

 inside: wires bright; tensile fracture. 



1 



Plow steel 



lubricated 



0.875 



7x 19 







751 



6,000 



48,200 



45,800 



-5 



Outside; 100% rust; inside: wires bright; tensile fracture. 



2 



Plow steel 



degreased 



0.875 



7x 19 







123 



6,000 



48,200 



48,200 







Outside: 100% rust; inside; wires light rust, few bright spots; 

 tensile and torsion fractures. 



2 



Plow steel 



degreascd 



0.875 



7x 19 







751 



6,000 



48,200 



49.300 



+2 



Outside: 100% rust; inside; wires light rust, few bright spots, 

 tensile fracture. 



3 



Plow steel 



degreased; covered with 

 10-mil polyethylene tape 



0.875 



7x 19 







123 



6.000 



48.200 



48,900 



+ 2 



Rust underneath tape for about 3 feet from ends; inside: 50% 

 light rust, 50% bright; tensile and torsion fractures. 



3 



Plow steel 



degreased; covered with 

 10-mil polyethylene tape 



0.875 



7x 19 







751 



6,000 



48,200 



48,200 







Heavy rust at edges and underneath tape for about 3 feet from 

 ends, inside; 75% light rust, 25% bright; tensile fracture. 



4 



Improved plow steel 



Zn 0.50 oz/ft 2 



0.250 



3 x 19 







189 



6,000 



" 



- 



- 



Outside light, uniform rust, heavy in some grooves. 



5 



Improved plow steel 



Zn 0.70 oz/ft 2 



0.500 



3x 19 







189 



6,000 



- 



- 



" 



Outside: yellow with few areas of heavy rust in grooves. 



6 



Improved plow steel 



Zn 0.90 oz/ft 2 



0.500 



3 x 7 







189 



6,000 



- 



- 



" 



Outside: grey-yellow, few areas of white corrosion products, 

 few areas of heavy yellow corrosion products in grooves. 



7 



Improved plow steel 



Zn 0.70 oz/ft 2 , 

 polyurethane jacket 



0.500 



3 x 19 







189 



6,000 



" 



" 



- 



No breaks in coating, white corrosion products on ends of 

 terminals; terminations not watertight. 



8 



Improved plow steel 



Zn 0.70 oz/ft 2 . 

 polyethylene jacket 



0.500 



3 x 19 







189 



6,000 



" 



" 



- 



No breaks in coating; white corrosion products on ends of 

 terminals; terminations not watertight. 



9 



Improved plow steel 



Zn 0.70 oz/ft 2 , punctured 

 polyethylene jacket 



0.500 



3x 19 







189 



6,000 



~ 







No rust at punctures in jacket; no breaks in coating; white 

 corrosion products at ends of terminals; terminations not 

 watertight. 



10 



A1SI Type 304 



not stress relieved 



0.1875 



3x 19 







189 



6,000 









Dull grey with light rust stains; 1 2-in. length near center of 

 wire covered with heavy red rust; some broken wires; when 

 cleaned, many broken wires, tunnel, pitting, and crevice 



11 



AISIType 304 



stress relieved 



0.1875 



3 x 19 







189 



6,000 



" 



" 



~ 



Dull grey; some light rust stains; heavy rust at edges of silicone 

 potting compound; broken wires at edge of silicone compound 

 under heavy rust at one end (crevice corrosion); when cleaned, 

 numerous broken wires, internal tunnel, pitting, and crevice 



12 



A1S1 Type 304 



not stress relieved 



0.1875 



3 x7 







189 



6,000 



- 



- 



~ 



Dull grey; light rust and some heavy rust in some areas; crevice 

 corrosion; when cleaned, broken wires, tunnel, pitting, and 



257 



