Products tagged with 'hydrofloric acid'

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A Survey of Plant Practices and Experience in HF Alkylation Units

Product Number: 51394-94511-SG

Author: J.D. Dobis, D.R. Clarida, J.P. Richert

Publication Date: 1994

$20.00

The T-8-20 Task Group conducted a survey of plant practices and of the performance of materials of constrution in HF Alkylation Units. A Primary goal of the survey was to expand the limited body of the information on alternative ally performance in HF Alkylation units and to better define the susceptibility of steel to hydrogen induced cracking.

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Electrochemical Corrosion Behavior of Carbon Steel With and Without Residual Elements

Product Number: 51320-14245-SG

Author: Suresh Divi, Sri Krishna Chimbli

Publication Date: 2020

$20.00

Residual elements (RE) in carbon steel, not specifically included in the specified steel, appear to influence the corrosion rate under certain conditions, especially in services involving hydrofluoric acid (HF). The relative proportions of RE, specifically %C, %Ni, %Cu, and %Cr in carbon steel base and weld metals used in refineries, especially in alkylation processes with HF as the catalyst, significantly impact corrosion behavior. Studies described in the literature show corrosion damage with high RE (Cu + Ni + Cr >0.20) components as compared to low RE (Cu + Ni + Cr <0.20) components.

In this study, electrochemical corrosion testing was performed on a 3-inch pipe elbow section with high REs that had developed a through-wall leak in service. Test results were compared to those obtained on a similar pipe elbow section with lower REs. The samples were exposed to 50% HF at room temperature and at 65°C. Linear polarization resistance (LPR) corrosion rates were measured at both temperatures. Potentiodynamic (PD) polarization scans were performed on samples of low and high RE steel exposed to 50% HF at room temperature.

Test results indicated that LPR corrosion rates were higher for the high RE carbon steel samples than for low RE carbon steel samples at both temperatures. PD scans showed that the critical current densities were higher for high RE steel than for low RE steel.

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NACE Publication 5A171-2007, Materials for Storing and Handling Commercial Grades of Aqueous Hydrofluoric Acid and Anhydrous Hydrogen Fluoride.

Product Number: 24057-SG

Publication Date: 2007

$179.00

HISTORICAL DOCUMENT. Materials used for receiving, storing, and handling commercial grades of aqueous hydrofluoric acid and anhydrous hydrogen fluoride. Materials avoided. Cost of equipment. Corrosive impurities.

Products tagged with 'hydrofloric acid'

A Survey of Plant Practices and Experience in HF Alkylation Units

Electrochemical Corrosion Behavior of Carbon Steel With and Without Residual Elements

NACE Publication 5A171-2007, Materials for Storing and Handling Commercial Grades of Aqueous Hydrofluoric Acid and Anhydrous Hydrogen Fluoride.

Association for Materials Protection and Performance