Effect of Zinc Silicate Workshop Primer on the Hydrogen Embrittlement Behavior of Hull Steel in Seawater

AN Baixiao; MA Xiao; LYU Xuesong; HE Qijian; HAO Fuyao; LU Tongjun; HOU Jian

doi:10.7643/ issn.1672-9242.2024.06.014

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Equipment Environmental Engineering ›› 2024, Vol. 21 ›› Issue (6) : 102-110. DOI: 10.7643/ issn.1672-9242.2024.06.014

Ships and Marine Engineering Equipment

Effect of Zinc Silicate Workshop Primer on the Hydrogen Embrittlement Behavior of Hull Steel in Seawater

AN Baixiao¹, MA Xiao², LYU Xuesong³, HE Qijian³, HAO Fuyao^2*, LU Tongjun², HOU Jian²

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Abstract

The work aims to investigate the effect of zinc silicate workshop primer on the hydrogen embrittlement behavior of hull steel in seawater, providing data support for the coating process of shipbuilding. Electrochemical tests, slow strain rate test (SSRT), and microscopic observation of fracture morphology were carried out to examine the corrosion resistance and hydrogen embrittlement behavior of hull steel in seawater with and without zinc silicate workshop primer. Under self-corrosion conditions, the SSRT fractures of both hull steel and its coated samples were mainly ductile fractures, with hydrogen embrittlement coefficients less than 10%, indicating no significant hydrogen embrittlement sensitivity. Under cathodic protection potential of -0.94 V, the SSRT macroscopic fractures of both hull steel and its coated samples exhibited varying degrees of tear marks, and the microscopic fractures showed small cleavage plane features. Among them, the samples with zinc silicate coating as the primer exhibited the most significant tear marks and cleavage plane features, with the most obvious increase in hydrogen embrittlement coefficient. When the surface of the hull steel/zinc silicate/epoxy abrasion-resistant coating was damaged, the hydrogen embrittlement sensitivity coefficient further increased. Under cathodic protection conditions, the presence of zinc silicate primer can increase the hydrogen embrittlement sensitivity of hull steel in seawater.

Key words

hull steel / zinc silicate coating / workshop primer / slow strain rate test / cathodic protection / hydrogen embrittlement

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AN Baixiao, MA Xiao, LYU Xuesong, HE Qijian, HAO Fuyao, LU Tongjun, HOU Jian. Effect of Zinc Silicate Workshop Primer on the Hydrogen Embrittlement Behavior of Hull Steel in Seawater[J]. Equipment Environmental Engineering. 2024, 21(6): 102-110 https://doi.org/10.7643/ issn.1672-9242.2024.06.014

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