MATERIAL - FINISHES AND COATINGS - ZINC, SILVER, CHROMIUM, NICKEL PLATES. EFFECT OF ELECTROPLATED AND CHEMICALLY PLATED COATINGS ON STRENGTH, CORROSION, HEAT RESISTANT AND ABRASION RESISTANT PROPERTIES OF 4340 STEEL AT 280,000 TO 300,000 PSI ULTIMATE STRENGTH
Abstract
Effect of electroplated and chemically plated coatings on strength, corrosion, heat resistant and abrasion resistant properties of 4340 steel at 280,000 to 300,000 psi ultimate strength. Test findings were as follows: (1) significant ulti mate and yield tensile strength losses did not result from plating; (2) reduction of area losses ranging 7% for chemical Ni to 98% for electro lyzed Cr occurred; (3) 55 and 84% of elongation was lost for all but electrolytic and chemical Ni plate. Baking restored the losses found with Ag plate and restored the losses experienced with Zn plating; zinc plated coatings resulted in the higher fatigue life. Post plating baking at 375 F was detrimental in every case; chemical Ni, Ag, electrolytic Ni, electrolyzed Cr and Zn resisted 200, 96, 96, 48 and 48 hr, respectively, of salt spray corrosion and chemical Ni coating showed the greater wear resistance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 27, 1957
- Accession Number
- AD0407602
Entities
People
- D. M. Forney Jr.
- R. J. Haney
- W. E. Wise
Organizations
- General Dynamics