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Slow strain rate tests for stress corrosion cracking were conducted on steel and stainless steel samples in modified 68 percent SO₂ battery electrolytes under a variety of conditions. On steel, the electrolytes without LiBr did not promote stress corrosion cracking. Stress corrosion cracking was observed on stainless steels in this electrolyte. Water additions appeared to have an inhibiting effect on the stress corrosion cracking of stainless steel.

Slow strain rate (SSR), Double Cantilever Beam (DCB), C-ring and corrosion coupons of Ti-alloys were used for corrosion testing in environments. Containing high levels of H₂S, chlorides and elemental sulfur. The test environments were selected to simulate deep sour gas well field environments typical of those found in Mobile Bay.

Two inhibitors were evaluated in order to assess performance in oilfield environments. Screening tests were conducted in a solution consisting of equal parts of water and oil.

A carburization test and evaluation was performed on selected alloy and coated coupons. The purpose of this test was to screen and compare coupons for their relative resistance to two (2) high temperature carburizing atmospheres.

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.

Presented herein are the results from the Task 1 nondestructive testing studies conducted under the a research program entitled, "Combatting Liquid Metal Attack of Aluminum Alloys by Mercury in Ethylene and Cryogenic Gas Plants". This program was organized and conducted by CLI International, Inc., under industrial multiclient support. The goal of the program was to develop preventative and remedial measures and detection and monitoring methods for mercury (Hg) attack of Al-alloys commonly used in the ethylene and cryogenic gas plant service.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.