Sodium Bromide Brine Corrosion Testing
The general, crevice and pitting corrosion, stress corrosion cracking and galvanic corrosion behavior were studied on seven CRAs (HC, HG, IG3, I625, I725, I825 and 925) and one low alloy steel (T-95), by autoclave exposure tests. The exposures were carried out in non-inhibited and inhibited NaBr packer fluid environments with 100 psia H2S and 700 psia CO2 at 450 F for thirty and ninety days.

   Hydrogen Charging In Hf Alkylation
Measurement of corrosion rates and steady state hydrogen permeation currents in environments containing hydrofluoric acid (hydrogen fluoride, HF) doped with arsenic (As) by electrochemical techniques.

   Hydrogen Permeation Tests At High Pressure/temperature
High pressure/high temperature hydrogen tests in simulated sour environments. The tests were performed on two types of steel flange materials and one pipe material. One steel flange was tested for hydrogen damage in sulfinol with acid gas up to 240 F (116 C) while the other was tested in hydrocarbon/condensate up to 340 F (171 C). The pipe steel was tested in sour brine up to 176 F (80 C).

   Corrosion Evaluation of Seamless Versus Welded Tubing
Electrochemical polarization measurements were performed on seamless, seamwelded, and buttwelded 316L, Inconel 825, and Monel 400 tubing in selected environments to study the general corrosion behavior. SSR tests were conducted on the seamless and buttwelded tubing specimens to evaluate the susceptibility to environmental cracking.

   Electrochemical Polarization Curves In Synthetic Seawater
Electrochemical anodic polarization measurements were performed on two AM355 materials, heat no. 8854-21 (AM355-1) and 7511-8 (AM355-2), per ASTM G-61 in deaerated synthetic seawater at 25°C. The materials were provided in the form of helicopter rotor straps. Twelve specimens from each helicopter rotor strap were tested.

SSC resistance of valve materials in High Pressure H₂S/CO₂ Environments
A series of test were conducted to evaluate the sulfide stress cracking (SSC) resistance of candidate low alloy steels for application in valve components. Fracture mechanics test methods were combined with autoclave exposures to develop information on the behavior of these materials in high pressure simulated field environments containing H2S, CO2 and brine.

Corrosion Behavior of Selected Stainless and Nickel Alloys, and Anti-Galling Coatings in a Sour Environment
This report summarizes an experimental investigation conducted on the behavior of various antigalling coatings in sour environments. Laboratory tests were conducted to examine the corrosion resistance of antigalling coatings and their effect on the corrosion behavior of selected stainless steels and nickel alloys.

Behavior of Aluminum Alloys in CO₂/Nacl Brine Environment
The present study was conducted to evaluate the performance of selected conditions of aluminum alloys in a CO2/brine environment at 80 F. The results indicate that the most severe attack is generally observed in the weld heat affected zone area. However, some materials were found that did not exhibit this type of attack. Generally, corrosion rates decreased with increasing exposure time. In all but one case, the corrosion was less severe on machined surfaces as compared to the as-received surface of the materials.

Evaluation of some SS and Ni alloys in Acidizing Environments
The present study involved the evaluation of selected stainless and nickel base alloys in the following acidizing media: (1) 15 percent HCl, (2) 28 percent HCl, (3) 12 percent formic acid and (4) 13 percent HCl/2 percent HF. Tests were conducted both with H2S and with CO2 at 200 F and 400 F.

Elastomer Material Evaluation in High Pressure Gaseous Environment
Samples of elastomeric materials were provided for evaluation of performance in high pressure gas environments containing CO2, CH4 and N2. Of particular concern are the effects of rapid decompression from test pressure and environmental degradation of the materials. The series of tests conducted in this investigation was developed to generate information that will aid in the selection of elastomeric materials for wellhead service where high pressures, temperatures and CO2 concentrations are present.

Corrosion Tests Under Simulated Steam Generator Conditions
A series of autoclave corrosion tests were conducted to simulate conditions in the steam generator. Nal-Prep III, a commercial passivating treatment, produced only slight reduction in the pitting rate on carbon steel. Type 316 stainless steel and more highly alloyed stainless steels showed no or low pitting and no stress corrosion cracking in the steam generator conditions. Alloys with low or no molybdenum such as Type 304 showed some pitting at the liquid-vapor interface. Electrochemical tests suggest that eliminating the caustic 94D4 wash water from the bottoms water may decrease pitting in the steam generator tubes.

Evaluation of Elastomers in Methane & CO₂ Environments
Samples of elastromeric materials were provided andevaluated to assess performance in a high pressure gas environment containing CO₂ and CH₄. The study presented herein was conducted as an extension to work, described earlier. All test methods employed presently are similar to those described in depth in the previous report and will be only briefly covered herein.

Corrosion Evaluation of Steel in LiBr Solutions
Corrosion tests conducted in inhibited 60% LiBr indicate that liquid phase corrosion rates remain low even up to 350 F. However, vapor phase and liquid-vapor interface corrosion rates are such that carbon steel will require protection above 300 F. 70-30 cupro-nickel showed low corrosion rates with no pitting at all temperatures tested. Grade 2 titanium showed significant pitting at all temperatures tested. Grade 7 titanium showed significant pitting at 300 F and above. Fluoroshield, a fluorocarbon polymer coating, performed well in these tests and appears to be a viable method for protecting carbon steel in LiBr environments.

Electrochemical Measurements of Localized and General Corrosion in LiBr
This work is relevant to a process design project that involves high capacity heat exchangers. The heat exchangers in question are slated to use a 65 percent LiBr solution as the heat transfer agent. The engineering question of concern is the compatibility of the LiBr fluid with the materials of construction of the heat exchangers.

Electrochemical Measurement of Corrosion Rates in Acetic Acid Process
This report details results of a test program to measure corrosion rate of five alloys as a function of temperature using electrochemical techniques. The test environment was a process fluid consisting of acetic acid, methyl acetate and methyl iodide.

Corrosion of Steel Alloys in CO₂ Environments
This report describes an experimental program to evaluate corrosion of carbon steels in CO2 environment. Coupon exposure and electrochemical tests were conducted as a part of the program. The objective of the test program was to determine the corrosion rate of steel exposed to wet CO2 conditions. Test variables were brine chemistry, CO2 partial pressure, temperature, metal alloy and exposure duration.