Stainless steel surface treatment technique for stainless steel chemical boat

Abstract

The present invention relates to stainless steel surface treating process for chemical cargo ship, and the process includes two parts of sectional polishing and spray pickling and deactivating. The process includes the following steps: welding stainless steel plates to form sections, polishing, healing up to form hull, polishing weld seams, pumping pickling and deactivating liquor with anticorrosive diaphragm pump into compartment, spraying pickling and deactivating liquor to each compartment, pumping out the used pickling and deactivating liquor, absorbing acid mist with alkali solution and washing the compartments with water. The treating process of the present invention can raise the anticorrosive capacity of the chemical cargo ship by over 20 times and increase the service life of chemical cargo ship greatly. The treating process has been performed practically.

Description

technical field

[0001] The invention relates to the field of shipbuilding, in particular to a stainless steel surface treatment process for a stainless steel chemical tanker. Background technique

[0002] Before 2005, the steel used in the domestic construction of chemical tankers was generally carbon steel, and the cargo compartment was painted with paint, and its anti-corrosion period was at most 3 years. If the type of chemical transported is changed, the inner layer of the cargo compartment needs to be repainted, which is not only expensive and time-consuming, but also the maintenance cost is also high. Therefore, stainless steel is mostly used as the main material in the construction of chemical tankers.

[0003] Stainless steel, especially domestic stainless steel, has a rough surface, poor quality, and a large number of defects such as pits and pits; while stainless steel is used in transportation, hoisting, assembly, welding, weld inspection (such as flaw detection, ...