Sandwich corrosion test

Test method for sandwich corrosion test Recommended practice for preparing, cleaning, and evaluating corrosion test specimens Practice for aqueous corrosion testing of samples of zirconium and zirconium alloys Test method for corrosion testing of products of zirconium, hafnium and their alloys in water at 633 K or in steam at 673 K [metric] Recommended practice for conventions applicable to electrochemical measurements in corrosion testing... 

Standard Test Method for Total Immersion Corrosion Test for Aircraft Maintenance Chemicals Standard Test Method for Pitting or Crevice Corrosion of Metallic Surgical Implant Materials Standard Test Method for Corrosion of Surgical Instruments Standard Test Method for Sandwich Corrosion Test... 

F1110 Tests methods for sandwich corrosion test... 

Chemistries involved in the formulation of compressor cleaners are very soft. These cleaners have all been tested for immersion corrosion, sandwich corrosion, and hot corrosion on metals, alloys, coatings, etc., used in the manufacture of compressors, and their affect on polymeric materials, rubber, silicone elastomers, epoxy adhesives, on painted surfaces, etc., according to existing US MIL-C-85704B specification Cleaning Compound, Turbine Engine Gas Path. ... 

Prior to the corrosion test, to obtain the optimum compressive load, the relationship between compressive deformation of the conductive polymer in the sandwich configuration, deformation rate, and electrical resistance were measured as shown in Figure 3. From the resistance data as a function of deformation rate in this figure, the deformation rate was chosen as 20 % in view of stability of the resistance for the compression. Hysteresis in the relationship between resistance and deformation rate for repeated stress was not observed. 

To investigate corrosion in heated crevices filled with wetted paste a sandwich test assembly was designed by Gleekman and Swandby simulating... 

Some rubber compositions, for example those containing reactive chlorine, can promote the surface corrosion of metals in contact with them, and in certain applications this can be sufficient to impair component performance. To guard against the use of such materials, a test method is described in ISO 6505 (BS903. Part A37). The procedure is similar to that for contact stain, in that a. sandwich of rubber and test surface, in this case a specified metal, is stored under load in a temperature-controlled environment for a given period. The measurement is a visual one and includes an indication of the ease of separation of the test rubber and the metal at the conclusion of the test. 

With these factors in mind, disc type coupons were chosen. These were similar to the American Sodety for Testing and Materials (ASTM) test coupons but smaller in diameter (100 and 70 mm) to facilitate transport. Single sheet coupons were used to evaluate pitting corrosion on exposed surfaces, and couples or sandwich type coupons were used to simulate crevice and/or galvanic corrosion. The coupons were cleaned and numbered, and the alloy type was identified using a laser scriber. The coupons were stacked in a stainless steel rack. This consisted of a steel pipe welded to a stainless steel base plate and threaded at the other end to hold the coupons in place with a stainless steel nut welded to a hook to enable the rack to be suspended with a nylon rope. A... 

The corrosion property of contact interface between the conductive polymer with 40 wt% carbon particle and Au plated printed circuit board was examined under a corrosive environment of H2S 3 ppm for 1000 hours at 40 c and 80 % relative humidity. The specimen arrangement is shown in Figure 1 two printed circuit boards hold the conductive polymer in a sandwich configuration at a deformation rate of 20 % in compression. After 1000 hours test, to evaluate the air - tight property of the polymer on the Au plated circuit board, discoloration and contact resistance for the surface of Au plate were examined. The contact resistance was measured by using Au probe with 1 mm/ as the other contact member under flowing a current of 0.15 mA and a contact load of 10 g. Corroded parts due to defects in the Au plate show a high level contact resistance because of contaminant films. On the contrary, for the uncorroded part, contact resistance is maintained at a low level. Therefore, contact resistance measurements can be used to evaluate the corrosion of the contact surface. 

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