Obere okpomọkụ corrosion bụ sulfur dioxide na sulfur trioxide emepụtara site na sọlfọ na mmanụ ọkụ n'oge usoro combustion na cylinder, nke abụọ bụ gas, nke jikọtara na mmiri na-emepụta hyposulfuric acid na sulfuric acid (mgbe cylinder mgbidi okpomọkụ bụ. dị ala karịa ebe igirigi ha), si otú ahụ na-akpụ corrosion dị ala okpomọkụ. .

Mgbe ọnụ ọgụgụ isi nke mmanụ cylinder dị ntakịrị, ihe nkwụnye dị ka agba ga-apụta n'elu oghere cylinder n'etiti ebe ịgba mmanụ ọ bụla, na elu nke cylinder liner n'okpuru ihe dị ka agba ga-agba ọchịchịrị site na corrosion. . Mgbe ejiri chrome-plated cylinder liner, ntụpọ ọcha (chromium sulfate) ga-apụta na ebe ndị mebiri emebi.

Ihe ndị na-emetụta mmebi okpomọkụ dị ala bụ sọlfọ dị na mmanụ mmanụ, uru alkali na mmanụ mmanụ mmanụ na mmanụ cylinder, na mmiri nke gas na-ekpo ọkụ. Ọdịnaya nke mmiri nke ikuku na-ekpochapụ ihe metụtara iru mmiri nke ikuku na okpomọkụ ikuku na-ekpochapụ.

Mgbe ụgbọ mmiri ahụ na-akwọ ụgbọ mmiri na mpaghara oke iru mmiri dị elu, ṅaa ntị ka ịlele nkwụsị nke mmiri na-ekpo ọkụ nke ikuku oyi.

Ntọala nke okpomọkụ mgbapụta nwere duality. Okpomọkụ dị ala nwere ike ịrụ ọrụ nke "ịjụ oyi na-ekpo ọkụ" na-ekpo ọkụ, iru mmiri nke ikuku na-ekpo ọkụ ga-ebelata, ike nke isi engine ga-abawanye; Otú ọ dị, ikuku ikuku na-ekpo ọkụ dị ala ga-emetụta okpomọkụ nke mgbidi cylinder. Ozugbo okpomọkụ nke mgbidi cylinder dị ala karịa ebe igirigi , obere okpomọkụ corrosion ga-eme mgbe uru isi nke ihe nkiri mmanụ cylinder dị na mgbidi cylinder ezughị oke.

A na-akpọ ya na okirikiri ọrụ isi engine na mgbe isi engine na-agba ọsọ na obere ibu, a na-atụ aro ka ọ dịkwuo elu okpomọkụ nke ọma iji zere mmebi okpomọkụ dị ala.

Iji mee ka mmiri dị jụụ nke isi engine cylinder liner na-eme ka mmiri dị jụụ belata, MAN ejiriwo usoro LCDL mee ka isi engine cylinder liner na-eme ka mmiri dị jụụ ruo 120 Celsius C iji gbochie mmebi okpomọkụ dị ala.