Electroforming repair of a nozzle approach section

Technical Report · Sun Aug 01 00:00:00 EDT 1976

DOI:https://doi.org/10.2172/7325054· OSTI ID:7325054

Johnson, H R; Dini, J W

Procedures were developed to repair by nickel plating the approach section of the 2.44-m (8-foot) HTST combustor from Langley Research Center. A 20.3-cm (8-inch) diameter test part fabricated by using the same procedures that were used for the full-size part showed good integrity and, when subjected to burst test, did not fail until it reached 8000 psi. This was a good indication that the repair procedure would be adequate for the full-size nozzle section, since intended operating pressure is only 500 psi. The repair process consisted of wedging aluminum strips over exposed open channels in the steel substrate and then cleaning, activating, and nickel-plating the region in need of repair. The key to the process was the use of a nickel sulfamate-sulfamic acid solution to prepare the nickel in the region of the repair zone for reception of the nickel plating without attacking the aluminum strips. Ring shear tests were used to check adhesion of the nickel plating. After completion of the plating, the part was subjected to a hydrostatic pressure of 500 psi and evidenced no signs of failure.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• DOE Contract Number: E(29-1)-789
• OSTI ID: 7325054
• Report Number(s): SAND-76-8031
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL
ELECTRODEPOSITION
ROCKET ENGINES
REPAIR
STEEL-ASTM-A106
ELECTROPLATING
ALUMINIUM
MECHANICAL TESTS
MEDIUM PRESSURE
NOZZLES
SHEAR
SULFURIC ACID
ALLOYS
CARBON STEELS
DEPOSITION
ELECTROLYSIS
ELEMENTS
ENGINES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
LYSIS
MATERIALS TESTING
METALS
PLATING
STEELS
SURFACE COATING
TESTING
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication